belt up

基本解释

The air hostess asked everyone to belt up.
空中小姐要大家扣好安全带。
You must belt up before you start to drive.
你必须在开始驾驶前系好座位安全带。
I should have done my seat belt up tighter, and not looked out of the window, not leaned over so far.
这次我又没有听她的话，不该把安全带系得那么松，不该朝窗外看，不该把身子倾得那么厉害。

I reached down and pulled him up on the horse by his belt.
Well after that, the bond price went up because people saw that as a sign that the company was tightening its belt and doing things right to have money to pay off the bondholders; so it was self-interested, I suppose--maybe you can ask him about this.
在这之后,债券的价格升高了,因为人们认为降低红利是一个信号,说明公司开始紧缩开支走向正轨,并且去偿付债券持有人,莱德利夫通过这种做法达到利己的目的,我想你们可以就此事向莱德利夫提问
耶鲁公开课 - 金融市场课程节选
Sometimes you need a belt to hold up your pants.

As a motorist, don't sit in a parked car studying the map: fasten your belt and fire up the engine in no more than five seconds.
ECONOMIST: Freedom, guns and women

to become or cause to become silent stop talking: often used in the imperative !