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English definition of “lighten”

lighten

verb [I or T] (MAKE/BECOME LESS SERIOUS)    /ˈlaɪ.tən/ US  /-t̬ən/
to (cause to) become happier and less worried: His mood lightened after the phone call. He tried to lighten the atmosphere by telling a joke.Causing pleasureReassuring
(Definition of lighten verb (MAKE/BECOME LESS SERIOUS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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