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English definition of “knockout”

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noun [C]  /ˈnɑkˌɑʊt/ us  

knockout noun [C] (BOXING)

( abbreviation KO) (in boxing) a situation in which a fighter falls after being hit and cannot get up in ten seconds: He won by a knockout in the tenth round.

knockout noun [C] (ATTRACTION)

slang a very attractive person or thing: She was a real knockout in her new dress.
(Definition of knockout from the Cambridge Academic Content Dictionary © Cambridge University Press)
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