A blood horse. A hunter. The toby gill clapped his bleeders to his galloper and tipped the straps the double. The highwayman spurred his horse and got away from the officers.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Gallore * Gallows BirdNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes