subs. (old).—1. The mouth or tongue; mum your DUBBER = hold your tongue. (Cf., DUB YOUR MUMMER, under DUB).
1789. G. PARKER, Life’s Painter, p. 150. DUBBER mum’d. To keep your mouth shut, or be obliged to hold your tongue.
2. (old).—A picklock. [From DUB, a key + ER.]—Grose, 1785.
