Meaning of “have/put your head on the block” in the English Dictionary

british dictionary

"have/put your head on the block" in British English

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have/put your head on the block

to risk a bad thing happening to you by doing something or helping someone:

I'm not going to put my head on the block for you.

(Definition of “have/put your head on the block” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)