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English definition of “brighten”

brighten

verb [I, T]     /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 .Emitting and casting light
HAPPY to become happier , or to make someone become happier : She brightened up when she saw him.Feeling pleasure and happinessTaking pleasure in something
(Definition of brighten verb from the Cambridge Learner's Dictionary © Cambridge University Press)

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