fall out

Từ điển Oxford Advanced Learner 8th

▪ I. ˌfall ˈout derived
1. to become loose and drop
•His hair is falling out.
•My tooth fell out.
2. if soldiers fall out, they leave their lines and move away
Main entry: ↑fall_derived
 
▪ II. ˌfall ˈout (with sb) derived
(BrE)to have an argument with sb so that you are no longer friendly with them
Main entry: ↑fall_derived