gaoler’s coach, n. — Green’s Dictionary of Slang

gaoler’s coach n.

[SE hurdle was a kind of frame or sledge on which traitors used to be drawn through the streets to execution; this remained part of the legal punishment for high treason until 1870]

a hurdle.

c.1698		B.E. Dict. Canting Crew n.p.: Goalers-Coach [sic] a Hurdle.
1725		New Canting Dict. n.p.: gaolers-coach a Hurdle.
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict. [as cit. 1725].
c.1750–1882		B.M. Carew Life and Adventures.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
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.
c.1850		Duncombe New and Improved Flash Dict.