Meaning of “knock yourself out” in the English Dictionary

british dictionary

"knock yourself out" in British English

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knock yourself out

phrasal verb with knock uk /nɒk/ us /nɑːk/ verb

to make yourself unconscious, usually by hitting your head:

She hit her head on the ceiling and knocked herself out.

informal to make yourself ill with tiredness:

If you carry on working like this, you'll knock yourself out.

(Definition of “knock yourself out” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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