To relax or take time out; to calm down. Also chill.(verb)
To hang out; spend time together with another person or group. Also chill.(verb)
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Use "chill out" in a sentence
"The resort's seven outstanding restaurant and bars, serves tantalizing international and Asian cuisine complimented with fine wines from across the globe while offering a choice of relaxing or funky ambiences for chill out times in the evening."
"Coals glowed red in several braziers to take the chill out of the room, and the servants moved like lemures in and out of the shadows."