Etymology
Advertisement

kayo

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

Others are reading

Advertisement
Advertisement
Definitions of kayo
1
kayo (v.)
knock unconscious or senseless;
Synonyms: knock cold / knock out
2
kayo (n.)
a blow that renders the opponent unconscious;
Synonyms: knockout / ko
From wordnet.princeton.edu