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 souring

(literally, figuratively) Characterised by sourness (all senses)

plural of whiskey sour

plural of amaretto sour

plural of pisco sour

plural of Boston sour

(literally) Grapes that are acid due to lacking maturity. / (idiomatic) Things that somebody pretends to despise because they cannot obtain or have.

(Britain, Australia, Canada) A cream that has been soured and thickened by using Lactobacillus bacteria; used in soups, salads and meat dishes such as beef Stroganoff.

a drink made from amaretto and a sweetened mixture of lemon or lime juice