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English definition of “lighten”

lighten

verb [I] (BECOME BRIGHT)    /ˈlaɪ.tən/ US  /-t̬ən/
to become less dark: The sky had lightened and there were breaks in the clouds. → Opposite darkenPale and colourless and causing colour to fade
(Definition of lighten verb (BECOME BRIGHT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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