I .
1.
( of the weather ) to become fine or bright :
I hope it clears up this afternoon.
2.
( of an illness, infection, etc. ) to disappear :
Has your rash cleared up yet?
II .
clear up | ˌclear sth ↔ ˈup
to make sth clean and neat :
It's time to clear up.
I'm fed up with clearing up after you !
Clear up your own mess!