| Acidify 1. (v. t.) To convert into an acid; to sour; as, to acidify sugar. 2. (v. t.) To sour; to embitter. Thesaurus Entries acetify, acidulate, alkalify, alkalize, borate, carbonate, catalyze, chemical, chlorinate, electrolyze, ferment, homopolymerize, hydrate, hydrogenate, hydroxylate, isomerize, nitrate, oxidize, pepsinate, peroxidize, phosphatize, polymerize, reduce, sour, sulfate, sulfatize, sulfonate, turn sour, work | ![]() |