split somebody up

Từ điển Oxford Advanced Learner 8th

▪ I. ˌsplit sb ˈup derived
to make two people stop having a relationship with each other
•My friend is doing her best to split us up.
Main entry: ↑split_derived
 
▪ II. ˌsplit sb ˈup | ˌsplit ˈup derived
to divide a group of people into smaller parts; to become divided up in this way
•We were split up into groups to discuss the question.
•Let's split up now and meet again at lunchtime.
Main entry: ↑split_derived