brighten Meaning in the Cambridge English Dictionary
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Meaning of “brighten” in the English Dictionary

"brighten" in British English

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brightenverb [I or T]

uk   /ˈbraɪ.tən/  us   /-t̬ən/

brighten verb [I or T] (LIGHTER)

to (​cause to) ​becomelighter: The ​room was ​small and ​dark, without so much as a ​ray of ​light to brighten the ​gloom. It was ​rainy this ​morning, but it brightened up (= the ​sunstartedshining) after ​lunch.

brighten verb [I or T] (HAPPIER)

to (​cause to) ​becomehappy or ​full of ​hope: Her eyes brightened when she ​saw him ​enter the ​room. There are, ​however, one or two ​items of good ​news to brighten the ​economicpicture a ​bit.
(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 ​roomwhite 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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