cheer up

Từ điển Oxford Advanced Learner 8th

ˌcheer ˈup | ˌcheer sb/sthˈup derived
to become more cheerful; to make sb/sth more cheerful
•Oh, come on— cheer up!
•Give Mary a call; she needs cheering up.
•Bright curtains can cheer up a dull room.
Main entry: ↑cheer_derived