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knockout

noun [C] (UNCONSCIOUS)
 
 
/ˈnɒk.aʊt/ US  /ˈnɑːk-/

Definition

in boxing, the act of hitting the other fighter so that they fall to the ground and are unable to get up again within ten seconds: a knockout punch/blow → See also knock sb outBoxing
(Definition of knockout noun (UNCONSCIOUS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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