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English definition of “knockout”

knockout

noun [C] (ATTRACTIVE)    /ˈnɒk.aʊt/ US  /ˈnɑːk-/ informal
a person or thing that looks, sounds, etc. extremely attractive: Your sister's a real knockout!Sexually attractive people
(Definition of knockout noun (ATTRACTIVE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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