THESAURUS
acidify
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
ROGET THESAURUS
acidify
Sourness
VB
be sour, sour, turn sour, set the teeth on edge, render sour,
acidify, acidulate.