the.com/chill

means To be calm, relaxed, and unbothered — or, as a verb, to cool something down or to hang out leisurely.

from From Old English 'ciele,' meaning frost or cold, related to the broader Germanic family of cold-words. For most of its life 'chill' was simply about temperature — a chill in the air, a chill down the spine. The slang sense of 'relaxed' or 'unbothered' is much younger, blooming in 20th-century American English, where 'chill out' and being 'chill' turned coldness into a compliment: cool, unhurried, gloriously detached.