Green’s Dictionary of Slang

1. grog.

1827

in P. Cunningham New South Wales.

2. any form of alcohol, a drink.

1930		(con. 1914–18) Brophy & Partridge Songs and Sl. of the British Soldier.
1938		F.D. Sharpe Sharpe of the Flying Squad 333: Also means ‘a drink.’ ‘Come and have a tumble.’.
1943		M. Harrison Reported Safe Arrival 94: Not the blessed smell of a tumble-down-the-sink in the ’ole house.
1960		J. Franklyn Dict. of Rhy. Sl.
1969		S.T. Kendall Up the Frog 12: I ’ad nine pints of pig’s ear an’ that’s a fair tumble dahn the sink.
1972		Dodson & Saczek Dict. of Cockney Rhy. Sl.
1979		R. Barker Fletcher’s Book of Rhy. Sl. 26: He made his way to the rub-a-dub, for a tumble down the sink.
1981		P. Wright Cockney Dialect and Sl. 98: Tumble dahn the sink ‘drink.’.
2002		D. Shaw ‘Dead Beard’ at www.asstr.org 🌐 Anyway, I’m sitting there with a glass of bum and stroke, having a tumble down the sink, when a mother of pearl on her pat malone comes alongside.