Green’s Dictionary of Slang

a very full glass.

c.1698		B.E. Dict. Canting Crew.
1763		G.A. Stevens in Adventures of a Speculist (1788) II 44: A tumbler fill, a brusher! I can bear it [...] ’tis neat good claret.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
a.1790		H.T. Potter New Dict. Cant (1795).
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.
1881		Trumble Sl. Dict. (1890).
1895		Crowe Aus. Sl. Dict. 12: Brusher, a full glass.