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having an acid taste, resembling that of vinegar, lemon juice, etc.; tart.

rendered acid or affected by fermentation; fermented.

producing the one of the four basic taste sensations that is not bitter, salt, or sweet.

characteristic of something fermented.

distasteful or disagreeable; unpleasant.

below standard; poor.

harsh in spirit or temper; acrimonious; disagreeable; peevish.

Agriculture.��(of soil) having excessive acidity.

(of gasoline or the like) contaminated by sulfur compounds.

Music.��off-pitch; badly produced.

something that is sour.

any of various cocktails consisting typically of whiskey or gin with lemon or lime juice and sugar and sometimes soda water, often garnished with a slice of orange, a maraschino cherry, or both.

any of various beers with a particularly acidic or tart taste, made so by acid-producing bacteria and yeast in the brew.

an acid or an acidic substance used in laundering and bleaching to neutralize alkalis and to decompose residual soap or bleach.

to become sour, rancid, mildewed, etc.; spoil.

to become unpleasant or strained; worsen; deteriorate.

to become bitter, disillusioned, or disinterested.

Agriculture.��(of soil) to develop excessive acidity.

to make sour; cause sourness in.

to cause spoilage in; rot.

to make bitter, disillusioned, or disagreeable.