Made cold or kept at a low temperature; also used informally to describe a relaxed, calm state of mind.
From Old English 'ciele' meaning cold or frost. The slang meaning of being relaxed or calm emerged in the 1980s, drawing on the metaphor of cooling down from heated emotions.
The phrase 'chill out' became popular in the 1980s hip-hop scene, later spawning the 'chill' music genre characterized by relaxed, downtempo beats. Scientifically, chilling food below 40°F slows bacterial growth exponentially, making refrigeration one of food safety's most important innovations.
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