knock out phr v [T] 1 [ knock sb ↔ out] to make someone become unconscious, especially by hitting them 击昏: Ali knocked out his opponent in the fifth round. 阿里在第五回合中将对手击昏。 2 [ knock sb/sth ↔ out] to defeat a person or team so that they cannot continue in a competition 淘汰: Indiana got knocked out in the first round. 印第安纳队在首轮比赛中被淘汰了。