verb. (old colloquial).To strip: e.g., UNRIG the drab = pull the whores clothes off (B. E. and GROSE); whence UNRIGGED = naked. Also (2) to plunder; and (3) of ships that are laid up (B. E.).
1692. DRYDEN, Juvenal, xiv. Lest he should be stolen, or UNRIGGD as Mars was.
1693. CONGREVE, The Old Bachelor, v. 1. Bell (in fanatic habit). I would UNRIG. Set. I attend you, sir.