Green’s Dictionary of Slang

gargle n.

[orig. medical student use]

1. [late 18C+] a drink, a measure of alcohol.

2. [late 19C+] alcoholic drink in general.

In compounds

gargle factory (n.) (also gargle house)

[late 19C+] a public house or bar.

gargle trap (n.)

[1940s] the throat.

In phrases

on the gargle (adj.)

[1940s+] drinking.