Insolvent sharpers, who make a profession of bailing persons arrested: they are generally styled Jew bail, from that branch of business being chiefly carried on by the sons of Judah. The lowest sort of these, who borrow or hire clothes to appear in, are called Mounters, from their mounting particular dresses suitable to the occasion. CANT.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Queer Wedges * Queer BirdsNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes