[UNDER-1 8 a, 4 a.] Working or acting in a secret or unapparent manner; also lit., working beneath.
1605. Daniel, Philotas, II. iii. Chorus C vj. There dost thou struggle Against some underworking pride that must Supplanted be.
1679. C. Nesse, Antid. agst. Popery, 87. He gives them up to the strong delusions of this under-working beast.
1818. Milman, Samor, 283. Deep echoed out From th underworking caverns.
1883. Century Mag., XXVI. 373/2. As a strong character in under working motive, Squire Gaylord seems to be his best.