To dive; to pick a pocket. To dive for a dinner; to go down into a cellar to dinner. A dive, is a thief who stands ready to receive goods thrown out to him by a little boy put in at a window. Cant.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
See also the definition in Nathan Bailey's 1736 dictionary of canting and thieving slang.
Distracted Division * DiverNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes