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lighten up

informal phrasal verb with lighten
 
/ˈlaɪ.tən/
 
US  /-t̬ən/ verb

Definition

to become more relaxed and less serious: Oh, lighten up! I was only joking! I wish she'd lighten up a bit.Calming and relaxing
(Definition of lighten up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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