Vinegar

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Vinegar

(a.) A sour liquid used as a condiment, or as a preservative, and obtained by the spontaneous (acetous) fermentation, or by the artificial oxidation, of wine, cider, beer, or the like.
(a.) Hence, anything sour; -- used also metaphorically.
(v. t.) To convert into vinegar; to make like vinegar; to render sour or sharp.