Green’s Dictionary of Slang

copper v.1

[cop v.; + ? faro jargon copper a bet, to bet that a given card will lose]
(US)

1. [mid–late 19C] to steal, to embezzle.

2. [late 19C] to kill.

3. [late 19C–1920s] to outwit, to spoil.

4. [late 19C–1950s] to obtain, to make sure of getting.