Definition of 'brighten'
- make lighter or brighter; "The paint will brighten the room"
Synonyms: lighten up lighten
- become clear; "The sky cleared after the storm"
Synonyms: clear up clear light up
- become brighter; "The sky brightened around noon"; "Her face brightened when she heard the good news"
Antonyms: darken dim
- become brighter; "The sky brightened"