off one's nut
English
    
    Pronunciation
    
- Audio (AU) - (file) 
Prepositional phrase
    
- (chiefly British, dated in US, idiomatic) Insane, crazy.
- 1909, P. G. Wodehouse, chapter 17, in Mike: A Public School Story:
- 1918, Rex Ellingwood Beach, chapter 11, in The Winds of Chance:- "Look at them rapids ahead of us! Why, the guy that laid out this river was off his nut!"
 
 
Synonyms
    
- off one's rocker (US)
References
    
- John Camden Hotten (1873) The Slang Dictionary
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