shower bath, n. — Green’s Dictionary of Slang

shower bath n.

[rhy. sl., Cockney pron. of shower bath, ‘shahr barf’ = half]

(dog-racing, ten shillings (50p); thus sporting) showers to a shilling, odds of 10:1.

1960		J. Franklyn Dict. of Rhy. Sl.
1972		Dodson & Saczek Dict. of Cockney Rhy. Sl.
1992		R. Puxley Cockney Rabbit.