To scour or score off; to run away: perhaps from SCORE; i.e. full speed, or as fast as legs would carry one. Also to wear: chiefly applied to irons, fetters, or handcuffs, because wearing scours them. He will scour the darbies; he will be in fetters. To scour the cramp ring; to wear bolts or fetters, from which, as well as from coffin hinges, rings supposed to prevent the cramp are made.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Scoundrel * ScourersNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes