'To sweat coin' definitions:

Definition of 'To sweat coin'

From: GCIDE

Sweat \Sweat\, v. t.
1. To cause to excrete moisture from the skin; to cause to perspire; as, his physicians attempted to sweat him by most powerful sudorifics. [1913 Webster]
2. To emit or suffer to flow from the pores; to exude. [1913 Webster]
It made her not a drop for sweat. --Chaucer. [1913 Webster]
With exercise she sweat ill humors out. --Dryden. [1913 Webster]
3. To unite by heating, after the application of soldier. [1913 Webster]
4. To get something advantageous, as money, property, or labor from (any one), by exaction or oppression; as, to sweat a spendthrift; to sweat laborers. [Colloq.] [1913 Webster]
To sweat coin, to remove a portion of a piece of coin, as by shaking it with others in a bag, so that the friction wears off a small quantity of the metal. [1913 Webster]
The only use of it [money] which is interdicted is to put it in circulation again after having diminished its weight by "sweating", or otherwise, because the quantity of metal contains is no longer consistent with its impression. --R. Cobden. [1913 Webster]