Definition of mouth in English:



Pronunciation /mouTH/
  • 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.

    • ‘The girl's mouth dropped slightly, as she recognized him.’
    • ‘Her wide mouth was twisted into a sneering frown.’
    • ‘Exerting an absurd amount of force, I clamped my gaping mouth closed.’
    • ‘Her rosebud mouth curved gently into a smile.’
    • ‘The corners of the other boy's mouth twitched up.’
    • ‘She gasped, her skin paled as she covered her gaping mouth and she backed away.’
    • ‘You can tickle your baby's chin or lower lip so the baby will open its mouth.’
    • ‘She tried to scream but the hand over her mouth contained a cloth, which seemed to muffle the noise.’
    • ‘One, taken in 1874 from slightly above, is of Ned unshaven, with thin mouth, narrow eyes, and the pinch of poverty.’
    • ‘As he looked right at me, cigarette teetering on his lower lip with his mouth slightly open, he didn't flinch.’
    • ‘I yawned widely, and covered my open mouth with my hand.’
    • ‘He lowered his mouth to her shoulder blade, running his lips lightly over the skin.’
    • ‘Suddenly her petal pink mouth was on mine and I was in heaven.’
    • ‘He stared at me with his darkly speculative eyes and down-turned mouth.’
    • ‘He downed the rest of the wine and wiped his mouth with the back of his hand.’
    • ‘That person was peering up at her from the first bench and her tiny mouth was set in a hard straight line.’
    • ‘Kate shouted as she covered the young woman's mouth with a gloved hand.’
    • ‘Cindy wiped her mouth with a napkin and slid her empty plate away from her.’
    • ‘Brittany patted her mouth with her napkin and laid it neatly on her lap.’
    • ‘His mother's mouth twitched in annoyance at the mention of the name.’
    lips, jaws
    View synonyms
    1. 1.1 The corresponding opening through which an animal takes in food (at the front of the head in vertebrates and many other creatures), or the cavity behind this.
      • ‘Nightjars have large heads and eyes and exceedingly wide mouths, used as scoops for catching insects in midair.’
      • ‘Young fish have been observed clinging to their parents with their mouths, even after they are able to swim freely.’
      • ‘Silk moth cocoons are made of a layer of silk that the caterpillar exudes from glands in its mouth.’
      • ‘Once the male has fertilized a clutch of eggs, he carries them in his mouth for one to two weeks, until they hatch.’
      • ‘They are aggressive fish, sometimes known to take food right out of the mouths of feeding sharks.’
      • ‘Once a snake seizes a victim in its mouth, it coils itself around the body.’
      • ‘In addition to two eyes and a mouth, this animal has markings suggesting gills.’
      • ‘Those that survive to become tadpoles often have misshapen mouths and are unable to feed properly.’
      • ‘This fish is recognized by its short broad snout with four barbels closer to the tip of the snout than the mouth.’
      • ‘Step three is to get the brush with paste into your dog's mouth and all the teeth brushed.’
      • ‘They have fleshy tentacles located above their eyes and below their mouths.’
      • ‘The other reason so many species co-exist on the grassland is also reflected in the structure of the animal's mouths.’
      • ‘Their mouths have been adapted for biting, making them efficient hunters.’
      • ‘Numerous bacterial and fungal species have been cultured from the mouths of alligators.’
      • ‘Their trunk is employed to pull branches off trees, uproot grass, pluck fruit, and to place food in their mouths.’
      • ‘These beasts often have enormous mouths and needlelike fangs.’
      • ‘The taste buds of the lake sturgeon protrude from the toothless mouth and are used to help in the selection of food.’
      • ‘Other fish have developed huge mouths and fangs so that they can eat practically whatever food they come across.’
      • ‘A ray eats its prey by grabbing the mollusk in its mouth and crushing the shell with its jaws.’
      • ‘In some vultures, the adults instead regurgitate food into the mouths of the chicks.’
    2. 1.2[usually with adjective] A horse's readiness to feel and obey the pressure of the bit in its mouth.
      ‘the horse had a hard mouth’
      • ‘The horse with the hard mouth almost immediately begins to lean on the bit.’
      • ‘A horse should accept the bit and chew it softly, that is a sign of an alive responsive mouth.’
      • ‘A horse with a hard mouth is basically immune to the amount of pressure given by the bit.’
      • ‘He has a fairly soft mouth as most of the time while riding I only need to use a very light contact.’
      • ‘Another thing he looks for is a deep mouth as this will aid him later on in the training.’
    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; impudence.
      ‘you've got more mouth on you than anyone I've ever known’
      • ‘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.’
      • ‘She had a bit too much mouth and not enough brain.’
      impudence, cheek, cheekiness, insolence, impertinence, effrontery, audacity, audaciousness, boldness, presumption, presumptuousness, sauciness, incivility, rudeness, disrespect
      View synonyms
  • 2An opening or entrance to a structure that is hollow, concave, or almost completely enclosed.

    ‘standing before the mouth of a cave’
    • ‘The plastic screen Ian had constructed across the mouth of the cave wasn't enough to keep the dust out.’
    • ‘Close to the cave mouth, portable generators can be used to power electric lights.’
    • ‘There was a stone bridge curving over the creek leading to a wide mouth of a small cave.’
    • ‘The clouds parted and the party emerged from the mouth of the small 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.’
    • ‘During the night, a number of spiders came and wove their webs all across the mouth of the 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.’
    • ‘The Shrine is within a massive cave, the mouth of which is about 150 ft wide.’
    • ‘Everything was packed, save for her blankets, and the others were gathered at the mouth of the cave.’
    • ‘When we got to the cave mouth, I got this uncanny feeling like I'd been there before.’
    • ‘Better results could be obtained by clamping them to the mouths of cannon, and blowing them to pieces.’
    • ‘The cave is fully 60 feet deep and there are a couple of routes that climb up and around the mouth of this cave.’
    • ‘He sees a movement up there, on the slope, near the mouth of the cave.’
    • ‘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.’
    • ‘The cave mouth was high up on the cliff face.’
    • ‘A plastic foam trapdoor covered the mouth of the narrow hole.’
    • ‘The frail man simply shook his head and headed for the mouth of the cave.’
    • ‘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 party arrived at the mouth of the cave, and Adrian explained the mission.’
    • ‘He pointed to the dark mouth of another underwater cave.’
    entrance, opening, entry, way in, entryway, inlet, access, ingress
    View synonyms
    1. 2.1 The opening for filling or emptying something used as a container.
      ‘the mouth of the bottle’
      • ‘But she just blows them a kiss and licks the froth from the mouth of the bottle.’
      • ‘She put her lips apprehensively to the mouth of the bottle, and took a large gulp.’
      • ‘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.’
      • ‘From the mouths of the bottles, big drops of water pop up in time to a complex, computer-controlled, choreographed program.’
      • ‘Ben pulled the cork from the mouth of the bottle and leaned forward to help Will drink.’
      • ‘Glasses with a wide bowl that tapers toward the mouth will allow the aroma of the wine to be released generously.’
      • ‘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.’
      opening, rim, lip
      View synonyms
    2. 2.2 The muzzle of a gun.
      • ‘The second mass of shot is placed in a wad with its base pointing towards the gun mouth, in the direction of firing.’
      • ‘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.’
      • ‘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 opening or entrance to a harbor or bay.
      ‘walking to the mouth of the bay to absorb the view’
      • ‘Otters are now spread across large swathes of the region and have even been spotted swimming in the mouth of Whitby harbour.’
      • ‘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.’
      • ‘It is expected to arrive at the mouth of Cork Harbour next Friday where it will be winched into the water.’
      • ‘He was able to describe a pattern of lights which seemed to place the yacht within sight of 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 rock, Big Black Carr, can be seen at the seaward extremity of St Abbs Bay, as you look out from the harbour mouth.’
      • ‘Being out on deck is even more of a pleasure as you head out of the mouth of the bay.’
      • ‘I felt woefully under waterproofed to face the weather beyond the harbour mouth.’
      • ‘Icebergs would languidly crumble to nothing just outside the mouth of the harbour.’
      • ‘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.’
      • ‘Eventually, as I near the harbour mouth, a rescue launch roars out to meet me and tows me in.’
      • ‘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.’
      • ‘Aitchison argues that had the harbour mouth been widened, more of the boats would have stood a chance of making it to safety.’
      • ‘There was even a galleon lurking near the mouth of the harbour, ostensibly harmless.’
      • ‘That evening we set off to fish the harbour mouth from the rock wall.’
      • ‘Wind over tide conditions at the mouth of Cork Harbour resulted in huge breaking seas over 20 ft high.’
      • ‘The largest trawler in the Dingle fleet, the Emerald Dawn, was grounded at the mouth of the harbour in early July.’
      • ‘Seas at the mouth of the bay were cresting at 10 feet.’
      • ‘As they got to the mouth of New York harbour, they got into difficulties and requested assistance.’
    4. 2.4 The place where a river enters the sea.
      • ‘Pilots are qualified professionals who know the river well enough to guide ships through the dangerous sand banks around the mouth of the river.’
      • ‘Eleven days later the main party reached the mouth of the Yellowstone River and camped there.’
      • ‘Numerous little port towns grew up at river mouths.’
      • ‘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.’
      • ‘Fish farmers are also under fire over siting farms close to river mouths.’
      • ‘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.’
      • ‘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.’
      • ‘Columbia was named after a sailing vessel that operated out of Boston in 1792 and explored the mouth of the Columbia River.’
      • ‘River mouths are dangerous places.’
      • ‘As silt increasingly built up at the river mouth, large ships had to anchor further and further out at sea.’
      • ‘New Orleans is a city built on silt and drained marshland, positioned at the mouth of the Mississippi River.’
      • ‘In a separate incident, a teenager had to be rescued from mud flats at the mouth of the River Wyre.’
      • ‘The mouth of the river dumps into Moreton Bay and the Pacific Ocean in northeastern Australia.’
      • ‘One late afternoon at low tide a hundred big sharks passed the beach near the mouth of a tidal river in a feeding frenzy.’
      • ‘Belfast sits at the mouth of the river Lagan and is encircled by green rolling hills.’
      • ‘The coastal boundary cuts across the mouths of all rivers and streams.’
      • ‘In winter, the Mew Gull inhabits coastal waters, and is commonly found in estuaries, river mouths, and freshwater ponds close to the shore.’
      • ‘A local man says that there is a small village named Adventure near the mouth of a river.’
      • ‘Villages were usually close to the sea and the mouth of a river.’
      outfall, outlet, debouchment, embouchure, debouchure
      View synonyms


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

    ‘this clergyman mouths platitudes in breathy, soothing tones’
    • ‘The guy is just sitting on his hands, while 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.’
    • ‘Repent, they admonish, and come back to signing agreements and mouthing platitudes.’
    • ‘They mouth slogans and psychobabble.’
    • ‘He is merely mouthing an administrator's script.’
    • ‘The environment minister is being condemned for mouthing politically correct platitudes.’
    • ‘Realistic promotion of abstinence is not the mere mouthing of platitudes such as ‘Just say ‘No’!’’
    • ‘Now she mouths all the normal platitudes about how the Real Message of the Gospel is Social Justice.’
    • ‘They shriek, they mouth inanities in the commentary box and on the stands.’
    • ‘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.’
    • ‘The company quickly reverted to the more standard practice of mouthing platitudes instead of the bald-faced truth.’
    • ‘Both of them are currently mouthing the proper platitudes.’
    • ‘She said that people should be wary of mouthing platitudes.’
    utter, speak, say
    pronounce, enunciate, articulate, voice, express, vocalize, verbalize
    say insincerely, say for form's sake
    View synonyms
    1. 1.1 Utter very clearly and distinctly.
      ‘she would carefully mouth the right pronunciation’
      • ‘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.’
      • ‘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’.’
    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’
      • ‘Tess mouthed silent thanks and blinked back tears.’
      • ‘Settling into a plastic chair, he became engrossed, silently mouthing the words as he read.’
      • ‘Quickly Matt mouthed a silent thank you to Kiara, who nodded in acceptance.’
      • ‘He stood expressionless in the dock, shaking his head and mouthing the word ‘no’ when asked if he had anything to say.’
      • ‘Mel mouthed the word ‘FAREWELL’ to him as she waved.’
      • ‘He raises his palms skyward and mouths a silent prayer.’
      • ‘I clambered back on stage, mouthing What the hell?’
      • ‘His lips began moving rapidly, mouthing the words to a prayer.’
      • ‘She mouths the word as if she can't bring herself to say it aloud.’
      • ‘With a labored breath, his pale, chapped lips mouthed her name.’
      • ‘Then before he was led out of the courtroom, he sneered at the media and mouthed the words ‘go home‘.’
      • ‘Maddy mouthed a thank you to her friend as they left and she nodded back.’
      • ‘Luke shook his head and silently mouthed the word ‘no’.’
      • ‘I can remember her looking at me and mouthing the words ‘I don't want to die’.’
      • ‘My eyes moved to his lips which were silently mouthing the words to the song.’
      • ‘As Erik stood up, Maria silently mouthed the words ‘I'm sorry’ to him.’
      • ‘Some mouthed silent words of thanksgiving while others joyfully praised the God of creation.’
      • ‘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’.’
      • ‘He mouthed an obscenity as he was led away.’
  • 2Take in or touch with the mouth.

    ‘puppies may mouth each other's collars during play’
    • ‘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.’
    • ‘Puppies like to mouth their owners' hands.’
    • ‘Dogs tend to mouth each other when playing.’
    • ‘My baby likes mouthing and chewing hard veggies.’
    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?’
      • ‘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.’
      • ‘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!’
      • ‘With less income, many prospective mothers fear another mouth to feed.’
      • ‘I would rather not have another mouth to feed.’
      • ‘For me, you are a mouth to feed, less important than the donkey.’
  • be all mouth

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

      • ‘We all know that down in London they are all mouth and no trousers.’
      • ‘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.’
      • ‘As far as I am concerned she is all mouth and no trousers.’
      • ‘He has acquired a bit of a reputation for being 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.’
      • ‘As far as I am concerned, she is all mouth and no trousers.’
      • ‘He could never be accused of 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.’
      boasting, bragging, empty talk, idle talk, bombast, fustian
      View synonyms
  • keep one's mouth shut

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

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

    • informal Say something.

      ‘sorry, I'll never open my mouth about you again’
      • ‘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.’
      • ‘I try to assume less before opening my mouth or offering information.’
      • ‘Next time you open your mouth to react to something, think twice.’
      • ‘You didn't even manage to get accurate information before you opened your mouth.’
      • ‘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.’
  • watch one's mouth

    • Be careful about what one says.

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

Phrasal Verbs

  • mouth off

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

      ‘he was mouthing off about society in general’
      • ‘Nobody shows off or mouths off quite as good as a Leo.’
      • ‘About half of them were prone to not listening to orders and mouthing off.’
      • ‘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.’
      • ‘He was just as into the avant-garde, but he was exploring it rather than mouthing off about it.’
      • ‘Kids learn how to be mature only by mouthing off to any authority figure they can.’
      • ‘‘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.’
      • ‘Maybe they've had a big boost in fundraising since he started mouthing off so publicly.’
      • ‘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.’
      • ‘My nice neighbours the other side said that she'd been in there, mouthing off about her partner and asking for drink.’
      • ‘If a kid mouths off, maybe he doesn't like you or maybe he's seen his mother beaten up by her boyfriend.’
      • ‘I'm sick of her mouthing off about me.’
      • ‘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.’
      • ‘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.’
      • ‘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.’
      • ‘There were loads of lads mouthing off.’
      • ‘There is nothing wrong with people mouthing off on a radio talk show.’
      • ‘He was then booked for mouthing off to the assistant referee.’
      • ‘He was mouthing off about something he knows nothing about.’
      • ‘She was overheard mouthing off about her rival.’
      • ‘When he mouths off to a pretty young teacher, he apologizes: ‘I'm sorry I sounded off on you.’’
      rant, spout, declaim, rave, jabber, sound off
      View synonyms
      1. 1.1Loudly criticize or abuse.
        • ‘When Mr Godfrey started mouthing off at Sergeant Newell, he made us go with him to the station.’
        • ‘They are often petty offenders - kids who have been caught shoplifting, mouthing off at police, or using drugs a couple of times, for example.’
        • ‘It was confirmed when you didn't mouth off at me earlier.’
        • ‘Some guy mouths off at him and they begin brawling.’
        • ‘They're busy mouthing off at each other.’
        • ‘He thought that perhaps it wouldn't be such a smart idea to mouth off at the person holding the gun.’
        • ‘Then a person came across in a boiler suit and started mouthing off at us.’
        • ‘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.’
        • ‘He was sent to cool off in the sin bin for mouthing off at the referee.’
        • ‘He refused to go quietly, mouthing off at the coach as he made his way to the dressing room.’
        • ‘He mouths off at the ref, but can't even get a booking.’
        • ‘I thought you'd have mouthed off at the guards until they beat you to death.’
        • ‘She had had to endure being mouthed off at all her childhood.’
        • ‘Before I get the chance to mouth off at her, she's in my face.’
        • ‘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.’
        • ‘He was only taken to the station because he mouthed off at a cop.’
        • ‘She's been like that ever since Lea turned around and started mouthing off at me.’
        • ‘You can't just go mouthing off at people for making simple mistakes.’
        • ‘Never again, did Sean ever mouth off at him.’
        • ‘She immediately got up and began mouthing off at the guy who had knocked me over.’


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