劍橋詞典 knockout noun [C] (UNCONSCIOUS) in boxing , the act of hitting the other fighter so that they fall to the ground and are unable to get up again within ten seconds （拳擊中的）擊敗對手的一擊，擊倒對手獲勝 a knockout punch /blow 使人倒地不起的一擊 也見knock sb out (MAKE UNCONSCIOUS) knockout noun [C] (COMPETITION) (US elimination tournament) a competition in which only the winners of each stage play in the next stage , until one competitor or team is the final winner 淘汰賽 The tournament is a straight knockout. 這次錦標(biāo)賽是直接淘汰賽。 a knockout competition /championship 淘汰賽／錦標(biāo)賽 knockout noun [C] (ATTRACTIVE) informal a person or thing that looks , sounds , etc. extremely attractive 極有吸引力的人（或物） Your sister's a real knockout! 你的妹妹真是令人著迷！ 習(xí)語a knockout blow 返回 knockout