Definition of mouth in US English:



Pronunciation /mouTH//maʊθ/
  • 1The opening in the lower part of the human face, surrounded by the lips, through which food is taken in and from which speech and other sounds are emitted.

    • ‘You can tickle your baby's chin or lower lip so the baby will open its mouth.’
    • ‘He lowered his mouth to her shoulder blade, running his lips lightly over the skin.’
    • ‘She gasped, her skin paled as she covered her gaping mouth and she backed away.’
    • ‘He stared at me with his darkly speculative eyes and down-turned mouth.’
    • ‘She tried to scream but the hand over her mouth contained a cloth, which seemed to muffle the noise.’
    • ‘I yawned widely, and covered my open mouth with my hand.’
    • ‘The girl's mouth dropped slightly, as she recognized him.’
    • ‘The corners of the other boy's mouth twitched up.’
    • ‘Cindy wiped her mouth with a napkin and slid her empty plate away from her.’
    • ‘As he looked right at me, cigarette teetering on his lower lip with his mouth slightly open, he didn't flinch.’
    • ‘That person was peering up at her from the first bench and her tiny mouth was set in a hard straight line.’
    • ‘Her rosebud mouth curved gently into a smile.’
    • ‘He downed the rest of the wine and wiped his mouth with the back of his hand.’
    • ‘Kate shouted as she covered the young woman's mouth with a gloved hand.’
    • ‘Her wide mouth was twisted into a sneering frown.’
    • ‘Exerting an absurd amount of force, I clamped my gaping mouth closed.’
    • ‘Suddenly her petal pink mouth was on mine and I was in heaven.’
    • ‘His mother's mouth twitched in annoyance at the mention of the name.’
    • ‘One, taken in 1874 from slightly above, is of Ned unshaven, with thin mouth, narrow eyes, and the pinch of poverty.’
    • ‘Brittany patted her mouth with her napkin and laid it neatly on her lap.’
    lips, jaws
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    1. 1.1 The opening through which an animal takes in food, corresponding to the human mouth.
      ‘the carp picks up the bait by sucking it into its mouth’
      • ‘Nightjars have large heads and eyes and exceedingly wide mouths, used as scoops for catching insects in midair.’
      • ‘Once a snake seizes a victim in its mouth, it coils itself around the body.’
      • ‘Step three is to get the brush with paste into your dog's mouth and all the teeth brushed.’
      • ‘They are aggressive fish, sometimes known to take food right out of the mouths of feeding sharks.’
      • ‘Numerous bacterial and fungal species have been cultured from the mouths of alligators.’
      • ‘In some vultures, the adults instead regurgitate food into the mouths of the chicks.’
      • ‘The other reason so many species co-exist on the grassland is also reflected in the structure of the animal's mouths.’
      • ‘Once the male has fertilized a clutch of eggs, he carries them in his mouth for one to two weeks, until they hatch.’
      • ‘Young fish have been observed clinging to their parents with their mouths, even after they are able to swim freely.’
      • ‘They have fleshy tentacles located above their eyes and below their mouths.’
      • ‘This fish is recognized by its short broad snout with four barbels closer to the tip of the snout than the mouth.’
      • ‘These beasts often have enormous mouths and needlelike fangs.’
      • ‘Silk moth cocoons are made of a layer of silk that the caterpillar exudes from glands in its mouth.’
      • ‘Their mouths have been adapted for biting, making them efficient hunters.’
      • ‘Their trunk is employed to pull branches off trees, uproot grass, pluck fruit, and to place food in their mouths.’
      • ‘A ray eats its prey by grabbing the mollusk in its mouth and crushing the shell with its jaws.’
      • ‘Other fish have developed huge mouths and fangs so that they can eat practically whatever food they come across.’
      • ‘In addition to two eyes and a mouth, this animal has markings suggesting gills.’
      • ‘The taste buds of the lake sturgeon protrude from the toothless mouth and are used to help in the selection of food.’
      • ‘Those that survive to become tadpoles often have misshapen mouths and are unable to feed properly.’
    2. 1.2usually with adjective A horse's readiness to feel and obey the pressure of the bit in its mouth.
      ‘the horse had a hard mouth’
      • ‘A horse with a hard mouth is basically immune to the amount of pressure given by the bit.’
      • ‘A horse should accept the bit and chew it softly, that is a sign of an alive responsive mouth.’
      • ‘The horse with the hard mouth almost immediately begins to lean on the bit.’
      • ‘Another thing he looks for is a deep mouth as this will aid him later on in the training.’
      • ‘He has a fairly soft mouth as most of the time while riding I only need to use a very light contact.’
    3. 1.3 The character or quality of a wine as judged by its feel or flavor in the mouth (rather than its aroma).
      • ‘The mouth of the wine is full bodied with flavors of ripe berries and soft, supple fine grained tannins.’
      • ‘This medium bodied wine's mouth is filled with a carry over of the nose's raspberries and strawberries.’
    4. 1.4informal Talkativeness or impudence.
      ‘you've got more mouth on you than anyone I've ever known’
      • ‘She had a bit too much mouth and not enough brain.’
      • ‘I am surprised you never came to visit me at my gym when you were training in Las Vegas since you have so much mouth when it comes to me.’
      • ‘‘He's got a lot of mouth,’ said Miranda.’
      impudence, cheek, cheekiness, insolence, impertinence, effrontery, audacity, audaciousness, boldness, presumption, presumptuousness, sauciness, incivility, rudeness, disrespect
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  • 2An opening or entrance to a structure that is hollow, concave, or almost completely enclosed.

    ‘standing before the mouth of a cave’
    • ‘In the old days a man would have sent a gun boat, shown them the glint of cold steel, perhaps blown a few from the mouth of a cannon as an example to the rest.’
    • ‘There was a stone bridge curving over the creek leading to a wide mouth of a small cave.’
    • ‘He pointed to the dark mouth of another underwater cave.’
    • ‘On the opposite bank, just 30 ft from the river and six feet above its normal level, is the wide mouth of the cave.’
    • ‘When we got to the cave mouth, I got this uncanny feeling like I'd been there before.’
    • ‘The cave mouth was high up on the cliff face.’
    • ‘The party arrived at the mouth of the cave, and Adrian explained the mission.’
    • ‘We then walked a few kilometres to the mouth of a small cave, which, as I was to find out, went deep into the mountain.’
    • ‘The cave is fully 60 feet deep and there are a couple of routes that climb up and around the mouth of this cave.’
    • ‘During the night, a number of spiders came and wove their webs all across the mouth of the cave.’
    • ‘The frail man simply shook his head and headed for the mouth of the cave.’
    • ‘He sees a movement up there, on the slope, near the mouth of the cave.’
    • ‘Close to the cave mouth, portable generators can be used to power electric lights.’
    • ‘Everything was packed, save for her blankets, and the others were gathered at the mouth of the cave.’
    • ‘The Shrine is within a massive cave, the mouth of which is about 150 ft wide.’
    • ‘A plastic foam trapdoor covered the mouth of the narrow hole.’
    • ‘The clouds parted and the party emerged from the mouth of the small cave.’
    • ‘Better results could be obtained by clamping them to the mouths of cannon, and blowing them to pieces.’
    • ‘The plastic screen Ian had constructed across the mouth of the cave wasn't enough to keep the dust out.’
    • ‘Nothing could be found and the party were on the point of giving up when a soldier spotted soap suds in the sea near the mouth of a cave.’
    entrance, opening, entry, way in, entryway, inlet, access, ingress
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    1. 2.1 The opening for filling or emptying something used as a container.
      ‘the mouth of the bottle’
      • ‘From the mouths of the bottles, big drops of water pop up in time to a complex, computer-controlled, choreographed program.’
      • ‘The other uncorks a bottle of chilled beer, and after cleaning the mouth of the bottle with her tongue, she places the beer in my hand.’
      • ‘She put her lips apprehensively to the mouth of the bottle, and took a large gulp.’
      • ‘Glasses with a wide bowl that tapers toward the mouth will allow the aroma of the wine to be released generously.’
      • ‘Ben pulled the cork from the mouth of the bottle and leaned forward to help Will drink.’
      • ‘It fits the mouth of the container and is locked tightly.’
      • ‘Madeleine noticed a few of the red drops on the cream carpet near the mouth of the bottle.’
      • ‘But she just blows them a kiss and licks the froth from the mouth of the bottle.’
      opening, rim, lip
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    2. 2.2 The muzzle of a gun.
      • ‘He passed the anti-aircraft ships at less than mast height in the very mouths of their guns and launched a torpedo at point blank range.’
      • ‘The second mass of shot is placed in a wad with its base pointing towards the gun mouth, in the direction of firing.’
      • ‘It was the cold mouth of the gun against my temple as I sat behind the wheel of my car that alerted me to the fact that it was indeed a hijack.’
    3. 2.3 The place where a river enters the sea.
      • ‘Villages were usually close to the sea and the mouth of a river.’
      • ‘River mouths are dangerous places.’
      • ‘Anglers in South Africa still target sharks, especially off the long beaches facing the Indian Ocean and in river mouths and estuaries after heavy rain.’
      • ‘The mouth of the river dumps into Moreton Bay and the Pacific Ocean in northeastern Australia.’
      • ‘A local man says that there is a small village named Adventure near the mouth of a river.’
      • ‘Columbia was named after a sailing vessel that operated out of Boston in 1792 and explored the mouth of the Columbia River.’
      • ‘The local governor was asked by the French commander if it would be allowed to fire a salute as it entered the mouth of the river.’
      • ‘New Orleans is a city built on silt and drained marshland, positioned at the mouth of the Mississippi River.’
      • ‘The coastal boundary cuts across the mouths of all rivers and streams.’
      • ‘Belfast sits at the mouth of the river Lagan and is encircled by green rolling hills.’
      • ‘Numerous little port towns grew up at river mouths.’
      • ‘As silt increasingly built up at the river mouth, large ships had to anchor further and further out at sea.’
      • ‘Round the headland a pair of towers safeguard a river mouth curling into a distant and indistinct sea.’
      • ‘Already by 1760 some upriver communities were calling on the Nova Scotia government to restrict net fishing at the mouths of rivers.’
      • ‘Pilots are qualified professionals who know the river well enough to guide ships through the dangerous sand banks around the mouth of the river.’
      • ‘In a separate incident, a teenager had to be rescued from mud flats at the mouth of the River Wyre.’
      • ‘Fish farmers are also under fire over siting farms close to river mouths.’
      • ‘Eleven days later the main party reached the mouth of the Yellowstone River and camped there.’
      • ‘One late afternoon at low tide a hundred big sharks passed the beach near the mouth of a tidal river in a feeding frenzy.’
      • ‘In winter, the Mew Gull inhabits coastal waters, and is commonly found in estuaries, river mouths, and freshwater ponds close to the shore.’
      outfall, outlet, debouchment, embouchure, debouchure
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    4. 2.4 The opening or entrance to a harbor or bay.
      ‘walking to the mouth of the bay to absorb the view’
      • ‘If your boat has come up the coast along the Delaware shore, you'll have no choice but to make the run across the bay's mouth.’
      • ‘Seas at the mouth of the bay were cresting at 10 feet.’
      • ‘Wind over tide conditions at the mouth of Cork Harbour resulted in huge breaking seas over 20 ft high.’
      • ‘The largest rock, Big Black Carr, can be seen at the seaward extremity of St Abbs Bay, as you look out from the harbour mouth.’
      • ‘Icebergs would languidly crumble to nothing just outside the mouth of the harbour.’
      • ‘Being out on deck is even more of a pleasure as you head out of the mouth of the bay.’
      • ‘There are five wrecks in all and they lie in the mouth of the old harbour, so the only way of safely diving on them is by boat.’
      • ‘The tidal currents across the bay mouth are effectively pushing the water in the bay round in a large circle.’
      • ‘There was even a galleon lurking near the mouth of the harbour, ostensibly harmless.’
      • ‘It is expected to arrive at the mouth of Cork Harbour next Friday where it will be winched into the water.’
      • ‘Otters are now spread across large swathes of the region and have even been spotted swimming in the mouth of Whitby harbour.’
      • ‘I felt woefully under waterproofed to face the weather beyond the harbour mouth.’
      • ‘The ship was being towed and had completed a two weeks voyage from Russia when it spent its first night anchored in the mouth of the bay.’
      • ‘The largest trawler in the Dingle fleet, the Emerald Dawn, was grounded at the mouth of the harbour in early July.’
      • ‘As they got to the mouth of New York harbour, they got into difficulties and requested assistance.’
      • ‘Aitchison argues that had the harbour mouth been widened, more of the boats would have stood a chance of making it to safety.’
      • ‘That evening we set off to fish the harbour mouth from the rock wall.’
      • ‘He was able to describe a pattern of lights which seemed to place the yacht within sight of the harbour mouth.’
      • ‘Eventually, as I near the harbour mouth, a rescue launch roars out to meet me and tows me in.’
      • ‘An earth embankment was built across the harbour mouth to protect the ships from the weather, and a castle was constructed at the top of the hill.’


[with object]
Pronunciation /mouT͟H//maʊð/
  • 1Say (something dull or unoriginal), especially in a pompous or affected way.

    ‘this clergyman mouths platitudes in breathy, soothing tones’
    • ‘She said that people should be wary of mouthing platitudes.’
    • ‘But such actors cannot be expected to mouth Marxist slogans convincingly.’
    • ‘Instead of mouthing platitudes about creating just and lasting settlements, we must turn the financial screws on both parties to make them see sense.’
    • ‘Both of them are currently mouthing the proper platitudes.’
    • ‘Realistic promotion of abstinence is not the mere mouthing of platitudes such as ‘Just say ‘No’!’’
    • ‘Repent, they admonish, and come back to signing agreements and mouthing platitudes.’
    • ‘They mouth slogans and psychobabble.’
    • ‘The environment minister is being condemned for mouthing politically correct platitudes.’
    • ‘He is merely mouthing an administrator's script.’
    • ‘When he says he expects to win, he will likely be speaking out of sincere conviction, not simply mouthing platitudes like many other candidates.’
    • ‘They were content to mouth the slogans and go through the motions.’
    • ‘They shriek, they mouth inanities in the commentary box and on the stands.’
    • ‘The guy is just sitting on his hands, while mouthing platitudes.’
    • ‘The company quickly reverted to the more standard practice of mouthing platitudes instead of the bald-faced truth.’
    • ‘Now she mouths all the normal platitudes about how the Real Message of the Gospel is Social Justice.’
    utter, speak, say
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    1. 1.1 Utter very clearly and distinctly.
      ‘she would carefully mouth the right pronunciation’
      • ‘Emily mouthed the words carefully as she faced him. ‘Thank you so much, Mr. Smith.’’
      • ‘I, in turn, pointed at myself and just as clearly mouthed out my name, ‘Lani’.’
      • ‘His teacher was mouthing each letter sound and having him repeat sequences.’
      • ‘By the end of the lesson students are carefully mouthing the correct English pronunciation.’
      utter, speak, say
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    2. 1.2 Move the lips as if saying (something) or in a grimace.
      ‘she mouthed a silent farewell’
      with direct speech ‘“Come on,” he mouthed’
      • ‘His lips began moving rapidly, mouthing the words to a prayer.’
      • ‘Tess mouthed silent thanks and blinked back tears.’
      • ‘Quickly Matt mouthed a silent thank you to Kiara, who nodded in acceptance.’
      • ‘She mouths the word as if she can't bring herself to say it aloud.’
      • ‘Some mouthed silent words of thanksgiving while others joyfully praised the God of creation.’
      • ‘Luke shook his head and silently mouthed the word ‘no’.’
      • ‘He mouthed an obscenity as he was led away.’
      • ‘Maddy mouthed a thank you to her friend as they left and she nodded back.’
      • ‘I clambered back on stage, mouthing What the hell?’
      • ‘Then before he was led out of the courtroom, he sneered at the media and mouthed the words ‘go home‘.’
      • ‘Settling into a plastic chair, he became engrossed, silently mouthing the words as he read.’
      • ‘Mel mouthed the word ‘FAREWELL’ to him as she waved.’
      • ‘My eyes moved to his lips which were silently mouthing the words to the song.’
      • ‘He stood expressionless in the dock, shaking his head and mouthing the word ‘no’ when asked if he had anything to say.’
      • ‘As Erik stood up, Maria silently mouthed the words ‘I'm sorry’ to him.’
      • ‘He raises his palms skyward and mouths a silent prayer.’
      • ‘I can remember her looking at me and mouthing the words ‘I don't want to die’.’
      • ‘She'd sat quietly as her father drove her to the hospital, wringing her hands in her lap and mouthing silent prayers for Mark.’
      • ‘He nodded when he heard her and mouthed back an ‘Alright’.’
      • ‘With a labored breath, his pale, chapped lips mouthed her name.’
  • 2Take in or touch with the mouth.

    ‘puppies may mouth each other's collars during play’
    • ‘My baby likes mouthing and chewing hard veggies.’
    • ‘Puppies like to mouth their owners' hands.’
    • ‘I put a drop noseband or something similar on the horse to stabilize his jaw so that the game of nipping or mouthing me just never even gets started.’
    • ‘Dogs tend to mouth each other when playing.’
    1. 2.1 Train the mouth of (a horse) so that it responds to a bit.
      • ‘The horse was mouthed properly as a youngster.’
      • ‘Mouthing a pony is the initial stage of breaking a pony and getting him to get used to the fact that he is going to be ridden.’
      • ‘If you're mouthing a young horse for the first time, start out by getting a few really good training books.’


  • a mouth to feed

    • A person, typically a child, who has to be looked after and fed.

      ‘how can they afford another mouth to feed?’
      • ‘With less income, many prospective mothers fear another mouth to feed.’
      • ‘Her step father gloated about how he got rid of a mouth to feed and how he didn't have to pay taxes for another three years!’
      • ‘I would rather not have another mouth to feed.’
      • ‘For me, you are a mouth to feed, less important than the donkey.’
      • ‘It does not matter to him now whether or not the baby is male or female because it would just be one more mouth to feed.’
  • be all mouth (and no trousers)

    • informal Tend to talk boastfully without any intention of acting on one's words.

      • ‘As far as I am concerned, she is all mouth and no trousers.’
      • ‘As far as I am concerned she is all mouth and no trousers.’
      • ‘We all know that down in London they are all mouth and no trousers.’
      • ‘Sadly, like many a learnèd professional, she was all mouth and no backbone.’
      • ‘He said that local politicians ‘were all mouth and no action’ on the issue and surely they could be doing more.’
      • ‘Were they a serious threat or all mouth and no trousers?’
      • ‘‘I guess it's just another case of a man who's all mouth and no trousers…’ I giggle, before climbing the stairs to my sanctuary.’
      • ‘He has acquired a bit of a reputation for being all mouth and no trousers.’
      • ‘Paul is being given advice about what to do on a date from his been-there-done-that pal Troy, who is all mouth and no trousers.’
      • ‘He could never be accused of being all mouth and no trousers.’
      boasting, bragging, empty talk, idle talk, bombast, fustian
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  • keep one's mouth shut

    • informal Not say anything, especially not reveal a secret.

      ‘would he keep his mouth shut under interrogation?’
      • ‘If I had kept my mouth shut then I would probably not have had all this hassle.’
      • ‘He didn't want to say anything, so he kept his mouth shut.’
      • ‘Don't sign anything, keep your mouth shut, and remember that we never had this conversation.’
      • ‘I now regret the entire business and wish I'd kept my mouth shut.’
      • ‘I could have kept my mouth shut but I felt I needed to speak out.’
      • ‘I have respect for someone that gets caught and keeps his mouth shut.’
      • ‘I've kept my mouth shut through all of this stuff.’
      • ‘I kept my mouth shut on the advice of my attorneys.’
      • ‘I've kept my mouth shut about this until now, as it's not very pleasant.’
      • ‘You kept your mouth shut or you were killed.’
      say nothing, keep quiet, not breathe a word, not tell a soul, not give the game away, keep it under one's hat
      View synonyms
  • open one's mouth

    • informal Say something.

      ‘sorry, I'll never open my mouth about you again’
      • ‘You didn't even manage to get accurate information before you opened your mouth.’
      • ‘Next time you open your mouth to react to something, think twice.’
      • ‘I try to assume less before opening my mouth or offering information.’
      • ‘A middle-aged woman who had seen the killing of a bail bondsman by a drug gang leader, was so scared she could not open her mouth on the stand.’
      • ‘After spending a great deal of the 1990s making speeches on education, I took a vow never to open my mouth on the subject again, at least in public.’
  • watch one's mouth

    • informal Be careful about what one says.

      • ‘After warning him to watch his mouth once again he walked off with his dogs.’
      • ‘I should also warn you to watch your mouth around him.’
      • ‘‘Todd Alexander, watch your mouth in front of your mother,’ Rob snapped.’
      • ‘I was the one who made sure that he watched his mouth in interviews.’
      • ‘In the locker-room, too, he will have to watch his mouth.’
      • ‘Please watch your mouth around here, young lady.’
      • ‘I'd watch your mouth if I were you.’
      • ‘You'll learn to watch your mouth when talking to me.’
      • ‘I know damn well what I'm saying, and no way in hell am I watching my mouth.’
      • ‘You should watch your mouth when there is a lady present.’

Phrasal Verbs

  • mouth off

    • 1Talk in an unpleasantly loud and boastful or opinionated way.

      ‘he was mouthing off about society in general’
      • ‘Kids learn how to be mature only by mouthing off to any authority figure they can.’
      • ‘Maybe they've had a big boost in fundraising since he started mouthing off so publicly.’
      • ‘I'm sick of her mouthing off about me.’
      • ‘My nice neighbours the other side said that she'd been in there, mouthing off about her partner and asking for drink.’
      • ‘There is nothing wrong with people mouthing off on a radio talk show.’
      • ‘She was overheard mouthing off about her rival.’
      • ‘If a kid mouths off, maybe he doesn't like you or maybe he's seen his mother beaten up by her boyfriend.’
      • ‘If your father mouths off to you about it, just remind him that he lives in your house and has to respect your rules now.’
      • ‘If TV cameras catch him spitting or swearing, you can bet that some retired cop, headmaster or right-wing politician will be mouthing off to the Monday papers about sloppy role models and the decline of civilisation.’
      • ‘He was then booked for mouthing off to the assistant referee.’
      • ‘There were loads of lads mouthing off.’
      • ‘When he mouths off to a pretty young teacher, he apologizes: ‘I'm sorry I sounded off on you.’’
      • ‘I'm checking in with her today, and instead of mouthing off on what I think she should do, I'm just going to listen.’
      • ‘I wondered about how many of them actually think like they purport to rather than simply mouthing off in this obnoxious way simply to wind people up.’
      • ‘Nobody shows off or mouths off quite as good as a Leo.’
      • ‘He was just as into the avant-garde, but he was exploring it rather than mouthing off about it.’
      • ‘‘You're always mouthing off about things,’ one of my friends told me the other day as I launched an attack on the cost of school trips these days.’
      • ‘About half of them were prone to not listening to orders and mouthing off.’
      • ‘He was mouthing off about something he knows nothing about.’
      • ‘He skips school constantly and, on the handful of days he does show up, he's either mouthing off or getting into big-time, black-eye fights.’
      rant, spout, declaim, rave, jabber, sound off
      View synonyms
      1. 1.1Loudly criticize or abuse.
        • ‘She had had to endure being mouthed off at all her childhood.’
        • ‘Some guy mouths off at him and they begin brawling.’
        • ‘He refused to go quietly, mouthing off at the coach as he made his way to the dressing room.’
        • ‘He was sent to cool off in the sin bin for mouthing off at the referee.’
        • ‘It was confirmed when you didn't mouth off at me earlier.’
        • ‘You can't just go mouthing off at people for making simple mistakes.’
        • ‘Before I get the chance to mouth off at her, she's in my face.’
        • ‘He thought that perhaps it wouldn't be such a smart idea to mouth off at the person holding the gun.’
        • ‘And so when someone blows up and mouths off at a guard or goes after somebody else about their kids, I totally understand where that emotion and that lightning-fast trigger comes from.’
        • ‘They are often petty offenders - kids who have been caught shoplifting, mouthing off at police, or using drugs a couple of times, for example.’
        • ‘She immediately got up and began mouthing off at the guy who had knocked me over.’
        • ‘He was only taken to the station because he mouthed off at a cop.’
        • ‘Never again, did Sean ever mouth off at him.’
        • ‘Then a person came across in a boiler suit and started mouthing off at us.’
        • ‘When Mr Godfrey started mouthing off at Sergeant Newell, he made us go with him to the station.’
        • ‘I thought you'd have mouthed off at the guards until they beat you to death.’
        • ‘After mouthing off at her, they turned it down a little bit, then a minute later cranked it up even louder than it was originally.’
        • ‘They're busy mouthing off at each other.’
        • ‘He mouths off at the ref, but can't even get a booking.’
        • ‘She's been like that ever since Lea turned around and started mouthing off at me.’


Old English mūth, of Germanic origin; related to Dutch mond and German Mund, from an Indo-European root shared by Latin mentum ‘chin’.