Green’s Dictionary of Slang

sunny bank n.

[pun on SE banking, a fire]

a good fire in winter.

[UK]B.E. Dict. Canting Crew n.p.: Sunny-bank a good rousing Winter-Fire.
[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.