n. /kay"oh", kay"oh'/ ; v. /kay"oh"/ , n. , pl. KO's , v. , KO'd, KO'ing . Slang.
n.
1. a knockout in boxing.
v.t.
2. to knock unconscious, esp. in a boxing match; knock out.
Also, K.O., k.o., kayo.
[ 1920-25; initial letters of knock out ]
n. /kay"oh", kay"oh'/ ; v. /kay"oh"/ , n. , pl. KO's , v. , KO'd, KO'ing . Slang.
n.
1. a knockout in boxing.
v.t.
2. to knock unconscious, esp. in a boxing match; knock out.
Also, K.O., k.o., kayo.
[ 1920-25; initial letters of knock out ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012