Green’s Dictionary of Slang

(UK Und.) searching for a victim whether for a theft, a confidence trick etc.

c.1698		B.E. Dict. Canting Crew n.p.: Hunting c. decoying or drawing others into Play.
1725		New Canting Dict. [as cit. c.1698].
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict. [as cit. c.1698].
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
a.1790		H.T. Potter New Dict. Cant (1795).
1801		‘Modern Dict.’ in Sporting Mag. May XVIII .
1809		G. Andrewes Dict. Sl. and Cant.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1835		G. Kent Modern Flash Dict.
1848		Flash Dict. in Sinks of London Laid Open.