spring sth on sb

spring作动词，其中有一个意思是to appear suddenly(突然出现;涌现)。

"Where did you spring from? - I didn't see you come in!"

“你从哪儿冒出来的?——我都没见你进来!”

to suddenly tell or ask someone something when they do not expect it

突然告诉或问某人他们没有想到的事情;突然告诉(某人);冷不防地问(某人)

I hope he's not going to spring any nasty surprises on us at the meeting this morning.

我希望今天上午的会议他不会冷不防对我们说出一些让人讨厌的话来。