clear up

This phrase means to become completely clear. You can use "clear up" to talk about weather:

If it doesn't clear up soon, we're going to have to cancel the game.

In this case, "clear up" means for the clouds to go away, and for any rain or snow to stop.

"Clear up" can also be used to discuss an illness:

I hope your cold clears up soon.

This phrase appears in these lessons: