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English definition of “KO”

KO

verb [T]     /ˌkeɪˈəʊ/ US  /-ˈoʊ/ (present participle KO'ing, past tense and past participle KO'd) informal
to make someone unconscious, especially in boxingBoxing to make someone feel very weak, tired, and ill: That flu really KO'd me for a while.Becoming and making less strongBeing and falling ill KO     noun [C] (KOs)
(Definition of KO verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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