brighten up
US /ˈbraɪ.tən ʌp/
UK /ˈbraɪ.tən ʌp/
1.
to make something more cheerful, lively, or attractive
:
•
Let's add some colorful flowers to brighten up the room.
•
A fresh coat of paint can really brighten up an old house.
2.
to become more cheerful or lively
:
•
Her face brightened up when she saw her friend.
•
The weather started to brighten up after the rain.