Definition of clot in US English:


nounPlural clots

  • 1A thick mass of coagulated liquid, especially blood, or of material stuck together.

    ‘a flat, wet clot of dead leaves’
    figurative ‘a clot of people arguing in the doorway’
    • ‘Stroke is caused by a clot which prevents blood from reaching the brain and is one of the single biggest killers behind cancer and heart disease.’
    • ‘Aspirin has been used to treat heart disease because it thins blood and prevents clots.’
    • ‘This drug has been proven to help keep platelets in the blood from sticking together and forming clots, which can help protect against a future heart attack or stroke.’
    • ‘The infected cells stick together, forming clots in the fine blood vessels of the brain.’
    • ‘The most common type of embolus is a clot of blood, but other things can cause an embolism too.’
    • ‘Blood clots can be deadly, leading to strokes, for example, or blocking the lungs' supply of blood from the heart.’
    • ‘She wiped away the little clot of blood on his right ear and kissed it.’
    • ‘Depression alters the propensity of the blood to form clots.’
    • ‘In a healthy person, the body is able to protect itself from excessive bleeding, by allowing a part of the blood called plasma to stick together and form clots.’
    • ‘This drop is later formed into a clot of blood, which assumes the shape of a small tissue.’
    • ‘My wife rushed me to the local emergency room where they gave me an EKG and administered blood thinners to break up the clot that was obstructing blood flow to my heart.’
    • ‘Blood clots can now be diagnosed within 3 hours by non invasive testing.’
    • ‘Blood clots form in a vein causing swelling and pain.’
    • ‘Soon I was sitting in a clot of vehicles high above Bay Ridge, alongside a station wagon full of young people.’
    lump, clump, mass, curdling
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  • 2British informal A foolish or clumsy person.

    ‘“Watch where you're going, you clot!”’
    • ‘Maybe somewhere my friend was being similarly greeted and on the cusp of turning from a loveable clot into a threatening idiot.’
    • ‘Meanwhile some clumsy clot seems to have copied and pasted from last year's invitations.’
    fool, idiot, ass, halfwit, nincompoop, blockhead, buffoon, dunce, dolt, ignoramus, cretin, imbecile, dullard, moron, simpleton, clod
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verbclotted, clots, clotting

  • 1Form or cause to form clots.

    no object ‘drugs that help blood to clot’
    with object ‘a blood protein known as factor VIII clots blood’
    • ‘Fluid from the ovaries prevents blood from clotting.’
    • ‘The creek is running, but it's as black as Baal's blood, black as the ichor of a god no one dares worship, and it runs like slow clotted goose fat.’
    • ‘Platelets are blood components that aid clotting.’
    • ‘They are looking at why some people have blood platelets which clot inside the vessels, causing blockages, starving the heart of oxygen, leading to a heart attack.’
    • ‘The blade came out easily, but it remained covered in thick, rancid-looking, clotted blood.’
    • ‘The snow had melted, showing sodden branches and clotted lumps of brown leaves through the woods.’
    • ‘She also had a condition which meant her blood was prone to clotting.’
    • ‘Haemophilia is caused by a deficiency of factor eight which causes the blood to clot.’
    • ‘People who take aspirin as part of a cardiotherapy regimen may have to use a different type of drug to keep their blood from clotting.’
    • ‘I cut my legs shaving, I thought the blood had finally clotted, so I put my stockings on - and smeared the blood.’
    • ‘Too much vitamin E can cause internal bleeding and can hinder blood clotting, at least in animals.’
    • ‘A blood sample may be taken to check for anaemia or abnormalities in the way blood is clotting.’
    • ‘‘It reduces the stickiness of platelets and makes the blood less able to clot, which is the cause of strokes,’ she said.’
    • ‘Samples were immediately removed from direct light and allowed to clot prior to chilling on ice.’
    • ‘Occasionall, nosebleeds happen in people with high blood pressure or with blood that doesn't clot properly.’
    • ‘The prothrombin test is one measure of how long it takes your blood to begin clotting.’
    • ‘Excessive amounts of these hormones cause a dangerous increase in blood pressure, blood clotting, and blood sugar.’
    • ‘She seems nervous suddenly, shrinking behind the face tan and clotted makeup.’
    • ‘It was long, but shallow, and the blood was clotting fast.’
    • ‘The thickened blood may clot in the fingers and toes, causing numbness, or in the brain, causing dizziness and confusion.’
    • ‘It can be caused by congenital defects or problems with the blood clotting.’
    coagulate, set, congeal, cake, curdle, thicken, solidify, harden, dry, stiffen
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    1. 1.1with object Cover (something) with sticky matter.
      ‘its nostrils were clotted with blood’
      • ‘Veiled by rain and ringed with cloud which clotted every crevice and clogged up the view, it felt like the only place left on earth.’
      • ‘On Saturday the sky was clotted with unseasonable gray clouds that hung over the San Gabriel Mountains, which rose sharply about a mile in the distance.’
      • ‘This prints with a dense black, slightly clotted effect, known as burr.’
      • ‘My long braided blonde hair was falling out, my chocolate colored eyes looked tired and my fair skin was clotted with dirt.’
      • ‘Your faces are clotted with pimples, and your hair is oily.’


Old English clott, clot, of Germanic origin; related to German Klotz.