To relax or calm down; a casual way of saying 'chill out' that's common in informal speech.
Shortened slang form of 'chill' or 'chill out,' which itself comes from 'chill' meaning to make cold, repurposed in 1980s hip-hop to mean 'relax and cool your temper.'
Slang words like 'chil' show how language naturally shortcuts common phrases—when people say something enough, they just lop off the ending! It's the linguistic equivalent of text messaging shorthand.
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