Definition of “lighten up” - English Dictionary

british dictionary

(Definition of “lighten up” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“lighten up” in American English

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lighten up

phrasal verb with lighten us /ˈlɑɪ·tən/ verb [ T ]

(MAKE NOT SERIOUS)

stop being so serious:

Why don’t you just relax and enjoy yourself? Lighten up!

(Definition of “lighten up” from the Cambridge Academic Content Dictionary © Cambridge University Press)