Meaning of “be/go off on one” in the English Dictionary

british dictionary

"be/go off on one" in British English

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be/go off on one

UK informal

to suddenly start talking or shouting in an angry way:

He went off on one and started accusing me of stealing his girlfriend.

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

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