kvass n. (written also quas and quass) A thin, sour beer, made by pouring warm water on rye or barley meal and letting it ferment, much used by the Russians.
... some kvass or water! [Exit LUKA] What a way to reason! A man is in desperate need of his money, and she won't pay it because, you see, she is not disposed to attend to money matters!... That's real silly feminine logic. That's why I never did like, and don't like now, to ... — Plays by Chekhov, Second Series • Anton Chekhov
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