lighten Meaning in Cambridge American English Dictionary
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Meaning of "lighten" - American English Dictionary

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lightenverb [T]

 us   /ˈlɑɪ·tən/

lighten verb [T] (MAKE NOT SERIOUS)

to make someone or become happier and less anxious: Being with friends lightened her mood.

lighten verb [T] (MAKE NOT HEAVY)

to reduce the weight of something: He lost 30 pounds to lighten the burden on his knee. To lighten is also to make an amount of work or a responsibility less heavy: To lighten the load, he decided to divide the job between two people.
Phrasal verbs
(Definition of lighten from the Cambridge Academic Content Dictionary © Cambridge University Press)
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