Won't this rain ever let up?这场雨难道不会停了吗？

There's a lot of work still to be done. We can't let up now.还有许多工作要做。我们现在不能放慢脚步。

The students might respond better if the teacher let up on [=eased up on] them a little.如果老师对他们不那么严厉的话，学生可能会表现得更好。

I let up on [=eased up on] the gas pedal.我松了松油门踏板。