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EnglishEdit

EtymologyEdit

Initialism of knock out.

NounEdit

KO (plural KOs or KO's)

  1. (boxing) Abbreviation of knock out.

VerbEdit

KO (third-person singular simple present KO's, present participle KO'ing, simple past and past participle KO'd)

  1. (transitive, boxing) To knock someone out, to render someone unconscious.
    Joe KO'd the other boxer.

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