Definition of “brighten” - Learner’s Dictionary


verb [ I, T ] uk us /ˈbraɪtən/ (also brighten up)

to become lighter or more colourful, or to make something become lighter or more colourful:

A picture or two would brighten up the room.

to become happier, or to make someone become happier:

She brightened up when she saw him.

(Definition of “brighten” from the Cambridge Learner's Dictionary © Cambridge University Press)