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Definition of knockout adjective from the Oxford Advanced Learner's Dictionary

knockout

adjective
 
/ˈnɒkaʊt/
 
/ˈnɑːkaʊt/
[only before noun]
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  1. (especially British English) 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
    Topics Sports: ball and racket sportsc2
  2. a knockout blow is something that hits somebody so hard that they can no longer get up
    • (figurative) The cancellation of the flight delivered the knockout blow to his plans.
    Topics Sports: other sportsc2
See knockout in the Oxford Advanced American Dictionary

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