Green’s Dictionary of Slang

(Aus.) an invitation to drink.

1918

Aussie (France) IX Dec. 19/2: The big Melbourne Show is in sight, and it’s going to be a ‘Dry’ Show. That means that the visitors can’t ask each other, ‘Can you stop one?’ or ‘Can you keep one down?’ or ‘What about it?’ or ‘Let’s kill a dog.’.