Green’s Dictionary of Slang

smiller n.

[ety. unknown]

a large glass of alcohol, a ‘bumper’.

a.1790
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1859
[UK]H.T. Potter New Dict. Cant (1795) n.p.: smiller a bumper.
[UK]G. Andrewes Dict. Sl. and Cant.
[UK]Flash Dict.
[US]Matsell Vocabulum.