Covered with or containing butter, or (slang) flattered someone excessively to get what you want.
From 'butter,' which came from Latin 'butyrum' via Old French. The word has described the dairy product since Old English times, with 'buttered' as its adjective form since medieval times.
Butter is one of humanity's oldest processed foods—it was discovered basically by accident when someone transported milk in a bag, and it completely changed how people preserved and enjoyed dairy products across cold climates.
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