brighten Definition in Cambridge British English Dictionary
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Definition of "brighten" - British English Dictionary

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brightenverb [I or T]

uk   /ˈbraɪ.tən/  us   /-t̬ən/

brighten verb [I or T] (LIGHTER)

to (cause to) become lighter: 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 sun started shining) after lunch.

brighten verb [I or T] (HAPPIER)

to (cause to) become happy 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 economic picture a bit.
(Definition of brighten from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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