Green’s Dictionary of Slang

(UK Und.) a constable.

c.1698		B.E. Dict. Canting Crew n.p.: Beck, a Beedle.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1848		Flash Dict. in Sinks of London Laid Open.