Coined in the 19th century for rainwater and shifted to drinking water by the 1930s.[1]
dog's soup (uncountable)
- (informal) Rainwater.
- (informal) Drinking water.
- ^ Afful, Bethel (2024 February 9) “20 Delightful Slang Terms From the 1930s”, in Mental Floss[1], retrieved 2024-08-18