Bedeutung von “brighten” — Learner’s Dictionary

brighten

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

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

A picture or two would brighten up the room.
HAPPY

to become happier, or to make someone become happier:

She brightened up when she saw him.

(Definition von “brighten” aus dem Cambridge Learner's Dictionary © Cambridge University Press)