adj Having an acidic, sharp or tangy taste.
adj Made rancid by fermentation, etc.
adj Tasting or smelling rancid.
adj (of a person's character) Peevish or bad-tempered.
adj Excessively acidic and thus infertile. (of soil)
adj Containing excess sulfur. (of petroleum)
adj Unfortunate or unfavorable.
adj (music) Off-pitch, out of tune.
n The sensation of a sour taste.
n A drink made with whiskey, lemon or lime juice and sugar.
n (by extension) Any cocktail containing lemon or lime juice.
n A sour or acid substance; whatever produces a painful effect.
n The acidic solution used in souring fabric.
v (transitive) To make sour.
v (intransitive) To become sour.
v (transitive) To spoil or mar; to make disenchanted.
v (intransitive) To become disenchanted.
v (transitive) To make (soil) cold and unproductive.
v To macerate (lime) and render it fit for plaster or mortar.
v (transitive) To process (fabric) after bleaching, using hydrochloric acid or sulphuric acid to wash out the lime.