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English definition of “chill out”

chill out

slang
verb [I/T] phrasal verb with chill  /tʃɪl/ us  
to relax instead of worrying or feeling anxious: If anything major happens we’re going to find out, so let’s chill out and just do what we need to do.
(Definition of chill out from the Cambridge Academic Content Dictionary © Cambridge University Press)
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