Green’s Dictionary of Slang

(UK Und.) to counterfeit; thus jerk a gybe v., to forge a license.

1612		Dekker ‘Canting Song’ O per se O O1: And Iybe well Ierkt, tick rome confeck, for backe by glymmar to mawnd. [Ibid.] O3: Canke and Dommerer thou could’st play, or Rum Mawnder in one day. And like an Abram cove could’st pray, yet pass with Iybes (well Ierk’t away).
1665		Head Eng. Rogue [as cit. 1612 (O3)].
a.1674		‘A Wenches complaint for . . . her lusty Rogue’ Head Canting Academy (1674) 17: [as cit. 1612 (O3)] .
1707		J. Shirley Triumph of Wit 196: [as cit. 1612 (O1)].
1754		Scoundrel’s Dict.