Definition of cool out phrasal verb from the Oxford Advanced American Dictionary

 

cool out

 phrasal verb
phrasal verb
 
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Phrasal Verbs

cool out

(informal)
 
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to relax and become calm after a period of activity or stress It's a wonderful place to cool out with a glass of beer. It sounds like he needs some time to cool out.
See the Oxford Advanced Learner's Dictionary entry: cool out