Definition of "KO"

KO

noun
plural KOs or KO's
1. (boxing) Abbreviation of knock out.
2. (sports) Abbreviation of kick-off. - the time or manner of start of play
verb
third-person singular simple present KOs or KO's, present participle KOing or KO'ing, simple past and past participle KOed or KO'd
1. (transitive, boxing) To knock someone out, to render someone unconscious.
2. (intransitive, sports) To start play.