【俚语】

An old head on young shoulders
年轻而老练

【例句】

He’s only seventeen, but he has an old head on young shoulders and remains calm under pressure.
他只有十七岁，但他少年老成，在压力下能够保持冷静。

Be off one’s head
发疯，精神错乱

【例句】

You must be off your head going out in this weather!
这种天气出去你真是发疯了！

Bury one's head in the sand
逃避现实

【例句】

Stop burying your head in the sand, Tim. Don’t pretend that everything’s all right.
Tim，别再逃避现实了。别假装一切都好

Give sb. a heads up 事先通知

【例句】

Just give me a heads-up if you need a ride.
如果你需要我载你一程，事先通知我。

Put their heads together
共同出谋划策

【例句】

If the two of you put your heads together, I'm confident you’ll figure out a workable solution.
如果你们两个人一起共同出谋划策，我相信你们会想出一个可行的办法。