Nip it in the bud 防患于未然
短语to nip it in the bud 意思是防患于未然或消灭于萌芽状态。
If he doesn't nip it in the bud, then the problem could soon get much worse.
She thought it was a very dangerous idea and should be nipped in the bud immediately.
另一个短语to nip out for something, 意思是快去快回。
Could you nip out to the shop and get me some milk, please?