Green’s Dictionary of Slang

a lock or door.

1703		Hell Upon Earth 5: Jig, a Lock or Door.
c.1786		Grose Classical Dict. of the Vulgar Tongue ms. additions n.p.: Jig, a Lock or Door, Cant.
1788, 1796		Grose Classical Dict. of the Vulgar Tongue (2nd, 3rd edn).
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.