Nobbler

a blow on the nob , a finishing stroke; “that's a nobbler  for him,” i.e., a settler.—Pugilistic.
a confederate of thimble-riggers and card-sharpers, who plays earnestly, as if a stranger to the “rig,” and thus draws unsuspecting persons into a game. The same as a “bonnet” or “bearer-up.” In the North of England, a low, cunning lawyer.