knock·out /ˈnɑkˌaʊt/
  把對手打倒在地的一擊;擊倒;被擊倒;引人注目的人物;轟動的事物
  knock·out /ˈnɑkˌaʊt/ 形容詞
  敲除
  knock·out, knock-out n. Act of knocking out, or state of being knocked out; the act of rendering a person unconscious by a blow. [wns=1]
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  knockout
       adj : very strong or vigorous; "strong winds"; "a hard left to the
             chin"; "a knockout punch"; "a severe blow" [syn: hard,
              severe]
       n 1: a very attractive or seductive looking woman [syn: smasher,
             stunner, beauty, ravisher, sweetheart, peach,
             lulu, looker, mantrap, dish]
       2: a blow that renders the opponent unconscious [syn: KO]