acesco

ăcesco, acui, 3, v. inch. [aceo],

to become sour , to turn sour : quodcumque infundis acescit, Hor. Ep. 1, 2, 54: lac, Plin. 20, 14, 53, 147: musta, id. 7, 15, 13; id. 11, 16, 15, § 45; 11, 35, 41, 118; Dig. 18, 1, 9, § 2 al.