kayo

noun, plural kay·os, verb, kay·oed, kay·o·ing.

1. KO.

noun, plural KO’s.

1. a knockout in boxing.

verb (used with object), KO’d, KO’ing.

2. to knock unconscious, especially in a boxing match; knock out.

noun plural kayos

1. boxing another term for knockout

verb kayoes, kayos, kayoing or kayoed

2. boxing another term for knock outSee knockout (verb)

verb KO’s, KO’ing, KO’d, k.o.’s, k.o.’ing or k.o.’d

1. a slang term for knock outSee knockout

noun plural KO’s or k.o.’s

2. a slang term for knockout

spelled-out form of K.O. (knockout), from 1923. Also used in 1920s as a slang reversal of OK.