an act of knocking someone out, especially in boxing (尤指拳击中)击倒对手取胜 [as modifier]a knockout blow. 击倒对手取胜的一拳。 ■(Brit.)a tournament in which the loser in each round is eliminated (英)淘汰赛 ■[in sing](informal)an extremely attractive or impressive person or thing (非正式)异常动人的人(或物),给人留下深刻印象的人(或物) he must have been a knockout when he was young. 他年轻的时候一定非常引人注目。