let up

let up  {v.},  {informal}

1. To become less, weaker, or quiet; become slower or stop.

It's raining as hard as ever. It's not letting up at all.

It snowed for three days before it let up and we could go outdoors.

2. To do less or go slower or stop; relax; stop working or working hard.

Grandfather has been working all his life. When is he going to let up?

Let up for a minute. You can't work hard all day.

Jim ran all the way home without letting up once.

Compare: SLOW DOWN.

Contrast: BEAR DOWN.

3. To become easier, kinder, or less strict. — Usually used with "on".

Let up on Jane. She is sick.

Syn.: EASE UP.

4. or change up

To pitch a ball at less than full speed in baseball. — Usually used with "on".