I.v. inch. n., to become sour in any thing, to turn sour (perh. not ante-Aug.).
II. Trop.: haec tibi per totos inacescant omnia sensus, let them sour. i. e. imbitter you, Ov. R. A. 307; cf.: “si tibi inacuit nostra contumelia,” App. M. 5, p. 163, 23.