Green’s Dictionary of Slang

(US Und.) any kind of trick that involves the sending of a victim home to get his money.

1940

D. Maurer Big Con 306: send store. Any type of store which plays for a mark and sends him home for his money.

1. (US Und.) working as a go-between to obtain drugs for a user does not know or cannot access a dealer.

1938		D. Maurer ‘Lang. of the Und. Narcotic Addict’ Pt 2 in Lang. Und. (1981) 106/2: To Be on the send or to have someone on the send. To obtain drugs through a runner or intermediary who makes the connection for a fee or for a share of the purchase.
1949		Monteleone Criminal Sl. (rev. edn).
1959		J.E. Schmidt Narcotics Lingo and Lore.

2. (US) running errands.

1967

M. Braly On the Yard (2002) 343: He turned butts into cash, a lot more than he needed to pay off that gimp-legged freeman he had on the send.

(US Und.) of a confidence trickster, to persuade the victim to fetch (more) money.

1937		(con. 1905–25) E.H. Sutherland Professional Thief (1956) 59: The fifth step is to put the prospect on the send.
1940		D. Maurer Big Con 4: Sending him home for this amount of money. (Putting him on the send.).
1979		‘Iceberg Slim’ Airtight Willie and Me 10: A six weeks crash course in how to stop and qualify [...] a mark, put him on the send (he goes to get his money) and how to rip him off.
2012		W. Keyser ‘Carny Lingo’ in http://goodmagic.com 🌐 ‘Put ’em on the send’ — To extract every last dime a person has and encourage them to go home (or to the ATM) for more.