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English definition of “conk out”

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conk out

informal
verb [T] uk phrasal verb with conk   /kɒŋk/ us    /kɑːŋk/ informal humorous
If vehicles and other machines conk out, they stop working or fail suddenly: I was just two miles from home when my motorbike conked out! to go to sleep very quickly, or to suddenly become unconscious: After a six-hour flight and a long day of meetings, it's not surprising you conked out.
(Definition of conk out from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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