Meaning of “brighten” in the English Dictionary

"brighten" in British English

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(Definition of “brighten” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"brighten" in American English

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brightenverb [ I/T ]

us /ˈbrɑɪ·tən/

brighten verb [ I/T ] (GET LIGHTER)

to become or make something lighter:

[ I ] The lights dimmed, then brightened.
[ M ] Betty painted the room white to brighten it up.

brighten verb [ I/T ] (BE HAPPY)

to become or make someone happy or hopeful:

[ T ] Her presence brightens my days.
[ I ] Anna’s face brightened at the thought of a vacation.

(Definition of “brighten” from the Cambridge Academic Content Dictionary © Cambridge University Press)