Short for complimentary, meaning something given free of charge, or to provide something at no cost.
Abbreviated from 'complimentary' in mid-20th century American slang, particularly in hospitality and entertainment industries. The full word comes from Latin 'complimentum' meaning 'that which completes courtesy.'
The casino industry popularized 'comp' culture, where high-value customers receive free rooms, meals, and shows. This practice has become so embedded in American service culture that 'comping' someone is now a standard business courtesy.
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