brighten Meaning in Cambridge American English Dictionary
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Meaning of "brighten" - American English Dictionary

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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)
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