• adj. 淘汰的；击倒的；迷人的
• n. 淘汰赛；击倒；给人留下深刻印象的人；绝代佳人

比喻用法。

knockout (n.)

also knock-out, in fighting, 1887, from verbal phrase knock out "to stun by a blow for a 10-count" in boxing, short for to knock out of time; see knock (v.) + out. Slang meaning "attractive person" is from 1892. To knock oneself out "make a great effort" is from 1936.

1. He delivered a knockout blow to all of his rivals.

他给所有对手以致命一击。

来自柯林斯例句

2. She was a knockout in navy and scarlet.

她身着藏青色和鲜红色相间的衣服，十分迷人。

来自柯林斯例句

3. The first story is a knockout.

第一个故事让人印象深刻。

来自柯林斯例句

4. the knockout stages of the tournament

锦标赛的淘汰赛阶段

来自《权威词典》

5. The fight was won by a knockout.

这场拳击以一击将对方打倒而获胜.

来自《现代英汉综合大词典》