simple past tense and past participle of sour

That has become or been made sour.

Having an acidic, sharp or tangy taste. / Made rancid by fermentation, etc. / Tasting or smelling rancid. / (of a person's character) Peevish or bad-tempered.

The sensation of a sour taste. / A drink made with whiskey, lemon or lime juice and sugar. / (by extension) Any cocktail containing lemon or lime juice.

(transitive) To make sour. / (intransitive) To become sour. / (transitive) To spoil or mar; to make disenchanted. / (intransitive) To become disenchanted.

The quality or condition of being sour, usually said of human personalities.

plural of sourness

present participle of sour

The process by which something is made, or becomes, sour; acidification. / The process by which fabric is soured, washing out the lime by means of acid. / (dated) Any sour apple. / (dated) Vinegar.

plural of sour