KO

n. [[t]ˈkeɪˈoʊ, ˈkeɪˌoʊ[/t]] v. [[t]ˈkeɪˈoʊ[/t]]

n. pl. KOs or KO's,

1) spo a knockout in boxing

2) spo to knock unconscious in boxing; knock out

Often, K.O., k.o. Etymology: 1920–25; initial letters of knock out