knock out
phrasal verbknock somebody out
to make somebody go to sleep or become unconscious 使入睡；使昏睡；使不省人事 (in boxing 拳击运动 to hit an opponent so that they cannot get up within a limited time and therefore lose the fight 击倒（获胜） - (informal)
to surprise and impress somebody very much 使大吃一惊；使倾倒；给某人留下深刻印象
knock somebody/yourself out
to make somebody/yourself very tired 使筋疲力尽；使疲惫不堪 Why knock yourself out for little income? 为什么要为了一点点收入而累垮自己？
knock somebody out (of something)
knock something out
knock yourself out
- (informal)
to go ahead and do what you want 把…淘汰出（比赛） You guys go and have fun. Knock yourselves out. 你们去玩吧。请自便。 If you like something and can afford it, I say knock yourself out. 如果你喜欢某样东西，又买得起，我说你自己敲吧。