brighten up
verbUS /ˈbɹaɪ̯ʔn̩ ʌp/ · /ˈbɹaɪtən ʌp/
1
Said of the weather To become brighter
2
To make cheerful.
- Her kindness brightened up my day.
- You can brighten up a room by hanging new wallpaper.
3
To become more attractive.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.