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nut

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NUT
NUT, the /ˌen juː ˈtiː/ abbreviation for
the National Union of Teachers; one of the main professional trade unions which represents teachers in England and Wales, in both government and private schools


nut
I
nut1 S3 /nʌt/ noun [countable]
 Language: Old English
 Origin: hnutu

1.  FOOD a dry brown fruit inside a hard shell, that grows on a tree:
    a pine nut
    roasted nuts
    We were sitting round the fire cracking nuts (=opening them).
2.
   TOOL .a small piece of metal with a hole through the middle which is screwed onto a bolt to fasten things together:
    Use a wrench to loosen the nut.
3.  CRAZY PERSON informal someone who is crazy or behaves strangely:
    My dad is such a nut.
    What are you, some kind of nut?
4. golf/opera etc nut informal someone who is very interested in golf etc ⇨ fanatic:
    You don’t have to be a sports nut to enjoy skiing.
5.  SEX ORGAN nuts [plural] informal a man’s testicles
6. the nuts and bolts of something informal the practical details of a subject or job:
    the nuts and bolts of government
7. tough/hard nut informal someone who is difficult to deal with:
    He may have softened a bit in his old age but he’s still a tough nut.
8. a hard/tough nut to crack a difficult problem or situation:
    Celtic have lost only once this season and will be a tough nut to crack.
9. be off your nut British English spoken informal to be crazy:
    You must be off your nut!
10. do your nut British English spoken to become very angry or worried:
    I didn’t get home till three – my mum did her nut!
11.  HEAD British English spoken old-fashioned your head or brain
    sb’s nut
    Oh come on, use your nut!

II
nut2 verb (past tense and past participle nutted, present participle nutting) [transitive] British English spoken
to hit someone with your head
   SYN  headbutt:
    He just turned round and nutted me!