let up片语动词

减弱、减缓、转小

The rain finally let up after three straight days.

连下三天之后，雨终于小了。

松懈、放松、歇口气

She never lets up until the whole project is finished.

整个项目完成之前，她从不松懈。

放宽要求、少施压常用于 let up on

You should let up on him; he's doing his best.

你该对他放宽一点，他已经很努力了。

减弱、停歇、缓和多用于否定句

There has been no letup in the summer heat this week.

这一周的酷热丝毫没有缓和。