Knockout

usgb/ˈnɑːkaʊt/Volume
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Complimentary UsagePlay
Used to express admiration, often in a romantic or physical attractiveness context. SlideUpon entering the room, everyone agreed she was a knockout.
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Slang ExpressionPlay
Informal and found mostly in casual conversation rather than formal writing. SlideYou should have seen him at the party, he looked like a knockout.