knockout

Universal Words noun, adjective noun 1 (abbreviation KO) (in boxing) a blow that makes an opponent fall to the ground and be unable to get up, so that he or she loses the fight: The match ended in knockout in the fifth round. 2 (informal) a person or thing that is very attractive or impressive: She's an absolute knockout. adjective [onlybeforenoun] 1 (especially BrE) a knockout competition is one in which the winning player/team at each stage competes in the next stage and the losing one no longer takes part in the competition: the knockout stages of the tournament 2 a knockout blow is one that hits sb so hard that they can no longer get up: a knockout punch