Definition of nut noun from the Oxford Advanced Learner's Dictionary

      

    nut

     noun
    noun
    BrE BrE//nʌt//
     
    ; NAmE NAmE//nʌt//
     
    Describing strange traits, How machines work
     
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  1. 1  (often in compounds) a small hard fruit with a very hard shell that grows on some trees to crack a nut (= open it) a Brazil nut a hazelnut nuts and raisins see also monkey nut
  2. 2a small piece of metal with a hole through the centre that is screwed onto a bolt to hold pieces of wood, machinery, etc. together to tighten a nut a wheel nut See related entries: How machines work
  3. 3(British English, slang) a person’s head or brain
  4. 4(British English also nutter) (informal) a strange or crazy person He's a complete nut, if you ask me. see also nuts, nutty See related entries: Describing strange traits
  5. 5(informal) (in compounds) a person who is extremely interested in a particular subject, activity, etc. a fitness/tennis/computer, etc. nut
  6. 6nuts [plural] (slang) a man’s testicles
  7. Word Origin Old English hnutu, of Germanic origin; related to Dutch noot and German Nuss.Extra examples The documentary focuses on the real nuts and bolts of the film-making process. a jar full of nuts and bolts nut-allergy sufferers I cracked a nut and ate it. She is allergic to nuts.Idioms (British English, informal) to become very angry She’ll do her nut when she finds out! (informal) a person who is difficult to deal with or to influence
    a hard/tough nut (to crack)
     
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    a difficult problem or situation to deal with
    the nuts and bolts (of something)
     
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    (informal) the basic practical details of a subject or an activity
    (British English, informal) crazy
    use a sledgehammer to crack a nut
     
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    to use more force than is necessary