Having an acid taste; sharp to the taste; tart; acid; specifically, acid in consequence of fermentation; fermented, and thus spoiled: as, sour bread; sour milk.Harsh of temper; crabbed; peevish; austere; morose: as, a man of a sour temper.Afflictive; hard to bear; bitter; disagreeable to the feelings; distasteful in any manner.Expressing discontent, displeasure, or peevishness: as, a sour word.Cold; wet; harsh; unkindly to crops: said of soil.Coarse: said of grass.Synonyms Acetous, acetose.2 andCross, testy, waspish, snarling, cynical.n. Something sour or acid; something bitter or disagreeable.n. Dirt; filth.n. An acid punch.n. In bleaching and dyeing:n. A bath of buttermilk or sour milk, or of soured bran or rye-flour, used by primitive bleachers.n. A weak solution of sulphuric or hydrochloric acid, used for various purposes. Compare souring, 5.To become sour; become acid; acquire the quality of tartness or pungency to the taste, as by fermentation: as, cider sours rapidly in the rays of the sun.To become peevish, crabbed, or harsh in temper.To become harsh, wet, cold, or unkindly to crops: said of soil.To make sour; make acid; cause to have a sharp taste, especially by fermentation.To make harsh, crabbed, morose, or bitter in temper; make cross or discontented; embitter; prejudice.To make harsh, wet, cold, or unkindly to crops: said of soil.In bleaching, etc., to treat with a dilute acid.To macerate and render fit for plaster or mortar, as lime.Sourly; bitterly.n. In drenching or puering skins, the old liquor which has become sour or turned.