KO Meaning in the Cambridge English Dictionary
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Meaning of “KO” in the English Dictionary

"KO" in British English

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KOverb [T]

uk   /ˌkeɪˈəʊ/  us   /-ˈoʊ/ (present participle KO'ing, past tense and past participle KO'd) informal
to make someone ​unconscious, ​especially in boxing to make someone ​feel very ​weak, ​tired, and ​ill: That ​flu really KO'd me for a while.
noun [C] uk   us   (KOs)
(Definition of KO from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"KO" in American English

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KOnoun [C]

 /ˈkeɪˌoʊ/ (plural KOs)
abbreviation for knockout
(Definition of KO from the Cambridge Academic Content Dictionary © Cambridge University Press)
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