Given something for free as a gift or favor, like when a restaurant comps your meal or a casino comps your hotel room.
Short for 'complementary' (from Latin 'complere', to complete/fulfill). Used as slang in hospitality and entertainment industries since the mid-1900s.
Casinos invented the word 'comping' as a psychology trick — by giving away 'free' food, drinks, and rooms to keep customers gambling longer, they profit far more than they give away, but it feels generous to the customer.
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