Tasting of acidity.
Lemons have a sour taste.
Made rancid by fermentation, etc.
Don't drink that milk; it's turned sour.
Tasting or smelling rancid.
His sour breath makes it unpleasing to talk to him.
The sensation of a sour taste.
A drink made with whiskey, lemon or lime juice and sugar.
Any cocktail containing lemon or lime juice.
From Middle English sour, from Old English sūr (“sour”), from Proto-West Germanic *sūr, from Proto-Germanic *sūraz (“sour”), from Proto-Indo-European *súHros (“sour”). Cognate with West Frisian soer, ...
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To become sour.
So the sun's heat, with different powers, / Ripens the grape, the liquor sours.
To spoil or mar; to make disenchanted.
To sour your happiness I must report, / The queen is dead.