clear something up

Từ điển Oxford Advanced Learner 8th

▪ I. ˌclear sthˈup derived
to solve or explain sth
•to clear up a mystery/difficulty/misunderstanding
Main entry: ↑clear_derived
 
▪ II. ˌclear ˈup | ˌclear sthˈup derived
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!
Main entry: ↑clear_derived