When a person receives silver in change to shift some good shillings and put bad ones in their place. The person who gave the change is then requested to give good shillings for these bad ones.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
To Ring a Peal * RipNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes