Green’s Dictionary of Slang

rank rider n.

[SE rank rider, a reckless rider, ult. Danish rank, upright, erect and thence proud, headstrong]

1. (UK Und.) a highwayman.

[UK]Dekker Lanthorne and Candle-Light Ch. 5: The divels Ranck-ryder, that came from the last Citty-hunting, understanding that two such Light-horsemen, were gon a Hawking, posts after and over-takes them.
[UK]R. Brome Eng. Moor V i: Even the Ranck-rider of the town, Sir, one Master Nathaniel Banelasse.
[UK]B.E. Dict. Canting Crew n.p.: Rank-rider, a High-way-man.
[UK]New Canting Dict. [as cit. c.1698].
[UK]Bailey Universal Etym. Eng. Dict. [as cit. c.1698].
[UK]Grose Classical Dict. of the Vulgar Tongue.
[UK]Lex. Balatronicum.
[UK]Egan Grose’s Classical Dict. of the Vulgar Tongue.

2. a jockey.

[UK]B.E. Dict. Canting Crew n.p.: Rank-rider [...] a Jockey.
[UK]New Canting Dict. [as cit. c.1698].
[UK]Bailey Universal Etym. Eng. Dict. [as cit. c.1698].