Definition of hat noun from the Oxford Advanced American Dictionary

      

    hat

     noun
    noun
    NAmE//hæt//
     
     
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  1. 1a covering made to fit the head, often with a brim (= a flat edge that sticks out) and worn out of doors a straw/woolen, etc. hat to put on/take off a hat
  2. 2(informal) a position or role, especially an official or professional role, when you have more than one such role I'm wearing two hats tonight—parent and teacher. I'm telling you this with my lawyer's hat on, you understand. see also old hat
  3. Idioms
    at the drop of a hat
     
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    immediately; without hesitating The company can't expect me to move my home and family at the drop of a hat.
    go hat in hand (to somebody)
     
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    to ask someone for something, especially money, in a very polite way that makes you seem less important There's no way he'll go hat in hand to his brother.
    my hat(old-fashioned)
     
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    used to express surprise
    hats off to somebody,I take my hat off to somebody,I tip my hat to somebody(informal)
     
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    used to say that you admire someone very much for something they have done
    I'll eat my hat(informal)
     
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    used to say that you think something is very unlikely to happen If she's here on time, I'll eat my hat!
    keep something under your hat(informal)
     
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    to keep something secret and not tell anyone else
    out of a/the hat
     
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    if something such as a name is picked out of a/the hat, it is picked at random from a container into which all the names are put, so that each name has an equal chance of being picked, in a competition, etc.
    pass the hat around(informal)
     
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    to collect money from a number of people, for example to buy a present for someone
    pull something/a rabbit out of the hat(informal)
     
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    to suddenly produce something as a solution to a problem
    throw your hat into the ring
     
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    to announce officially that you are going to compete in an election, a competition, etc.
See the Oxford Advanced Learner's Dictionary entry: hat