An American term for a carbonated soft drink dispensed directly from a soda fountain machine — the kind you get at fast-food restaurants, movie theaters, and convenience stores where you fill your own cup. Fountain drinks are distinct from canned or bottled sodas in taste (the CO2 ratio is often higher) and in culture (the free refill is a sacred institution). Americans have strong opinions about which chains serve the best fountain Coke.
He always upgraded to the large fountain drink because the free refills made it feel like a better deal.
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(US) A soft drink dispensed from a soda fountain.
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