Meaning of “be/go round the twist” in the English Dictionary

british dictionary

"be/go round the twist" in British English

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be/go round the twist

also send sb round the twist UK old-fashioned

to be, become, or make someone else become angry or unable to behave in a reasonable way:

If I'd stayed there any longer, I'd have gone round the twist.

(Definition of “be/go round the twist” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)