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English definition of “lighten”

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lighten

verb [T]  /ˈlɑɪ·tən/ us  

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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