lighten up

verb
lightened up; lightening up; lightens up

Definition of lighten up

intransitive verb

: to take things less seriously

First Known Use of lighten up

1911, in the meaning defined above

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Time Traveler for lighten up

The first known use of lighten up was in 1911

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Rhyming Dictionary: Words that rhyme with lighten up

Nglish: Translation of lighten up for Spanish Speakers

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