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1、Knock yourself out = 你去做吧（有无所谓的意思）
Go for it!
Have fun!
Do whatever you want, I don’t care!
Ex: Should I eat this spoonful of wasabi?（芥末）
Go ahead, knock yourself out.

Knock out (v)= （击倒，晕倒）
KO!! (wwe里面有的 ，击倒的意思）
Pass out
Go to sleep
EX: I was completely knocked out after taking that sleep medicine.（我吃了这个药之后立刻就睡着了）
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Knock out (n) =
A very beautiful sexy woman
EX: Angelina Jolie is a total knock out.

2、Knock up 怀孕 不是很尊重的语气

3、Knock it off = 停止吧
Stop it!
Quit it!
Stop annoying me! Knock it off!

4、Keep an eye out for somebody/something =
留心，注意某人某事
Watch out for
EX: Would you please keep an eye out for my keys? I think I left them somewhere in this room.

5、Keep an eye peeled for somebody/something = peel是剥皮的意思
Watch very carefully for …
EX: We should be close to the campground. Keep your eyes peeled for signs.

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