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lighten

 
 
/ˈlaɪtən/ verb

Definition

LESS SERIOUS [I, T] If a serious situation lightens, it becomes less serious, and if something or someone lightens it, they make it less serious: Her mood lightened a bit when I asked about her holiday. He tried to lighten the atmosphere by telling a joke.
lighten the burden/load to reduce the amount of work or trouble someone has to deal with
LESS DARK [I, T] to become less dark, or to make something less dark: The sun had lightened her hair.
(Definition of lighten verb from the Cambridge Learner's Dictionary © Cambridge University Press)

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