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English definition of “knock yourself out”

knock yourself out

phrasal verb with knock     /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.Tired and making tired
(Definition of knock yourself out from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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