[UNDER-1 8 a, 4 a.] Working or acting in a secret or unapparent manner; also lit., working beneath.

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1605.  Daniel, Philotas, II. iii. Chorus C vj. There dost thou struggle … Against some underworking pride that must Supplanted be.

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1679.  C. Nesse, Antid. agst. Popery, 87. He gives them up to the strong delusions of this under-working beast.

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1818.  Milman, Samor, 283. Deep echoed out From th’ underworking caverns.

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1883.  Century Mag., XXVI. 373/2. As a strong character in under working motive, Squire Gaylord seems to be his best.

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