KO
noun/ˌkeɪ ˈəʊ/
/ˌkeɪ ˈəʊ/
(also kayo)
[countable, uncountable]- (in boxing) a hard hit that makes an opponent fall to the ground and be unable to get up, so that they lose the fight (the abbreviation for knockout)
- He regained the world heavyweight crown with a fifth-round KO of his American opponent.
- The Russian has won most of his bouts by KO.
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KO