American English

Definition of knockout noun from the Oxford Advanced American Dictionary



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  1. 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. 2(informal) a person or thing that is very attractive or impressive She's an absolute knockout.
See the Oxford Advanced Learner's Dictionary entry: knockout

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