KO verb 2noun 2forms 7 verb2 •To knock someone out; to render someone unconscious.Joe KO'd the opposing boxer. •To start play. noun2 •Abbreviation of knock out. •Abbreviation of kick-off (“the time or manner of start of play”). formsKO'd · KO'ed · KOed · KO'ing · KOing · KO's · KOs
