Green’s Dictionary of Slang

(UK Und.) a thief.

1725		New Canting Dict. n.p.: He’s one of the Kin, let him pike; said of a Brother Rogue whom one of the Gang knows to be a Villain, tho’ not one of their Crew.
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict. [as cit. 1725].
1790		‘The Bowman Prigg’s Farewell’ in Wardroper (1995) 283: Then aideu to all kins and knots, / To kid-layers, files and trapanners.