Definition of “snap sb's head off” - English Dictionary

british dictionary

“snap sb's head off” in British English

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snap sb's head off

to answer someone in an unreasonably angry way:

There's no point trying to discuss anything with him if all he's going to do is snap your head off.

(Definition of “snap sb's head off” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)