cave in

Từ điển Oxford Advanced Learner 8th

▪ I. ˌcave ˈin (on sb/sth) derived
(of a roof, wall, etc.)to fall down and towards the centre
•The ceiling suddenly caved in on top of them.
related noun ↑cave-in
Main entry: ↑cave_derived
 
▪ II. ˌcave ˈin (to sth) derived
to finally do what sb wants after you have been strongly opposing them
•The President is unlikely to cave in to demands for a public inquiry.
Main entry: ↑cave_derived