Additional servings or amounts of something (usually a drink) that you get again after the first one is finished.
From 're-' (again) + 'fill' (to make full). This compound became common in American English around the 1920s-30s with the rise of restaurants and self-service cafes offering free refills.
The 'free refills' concept is almost uniquely American—most countries charge per drink, but American restaurants pioneered the business model of giving unlimited refills to keep customers happy and drinking more. It's now such an expectation that people are surprised when they can't get one!
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