growler (n.)"pitcher or other vessel for beer," 1885, American English slang, of uncertain origin; apparently an agent noun from growl (v.). The thing itself owes its popularity to laws prohibiting sale of liquor on Sundays and thus the tippler‘s need to stock up. Also in early use in the expression work the growler "go on a spree." Also late 19c. slang for a four-wheeled cab.
