Verb: lighten up
- Make more cheerful
- lighten, buoy up
- Become more cheerful
"after a glass of wine, he lightened up a bit";
- lighten, buoy up
- Become lighter
"The room lightened up";
- lighten
- Make more cheerful through the use of colour
"The paint will lighten up the room";
- brighten, lighten
Derived forms: lightening up, lightened up, lightens up
Type of: alter, buck up [informal], change, cheer, cheer up, jolly [informal], modify
Antonym: weigh down