To make a leg; to bow. To give leg-bail and land security; to run away. To fight at the leg; to take unfair advantages: it being held unfair by back-sword players to strike at the leg. To break a leg; a woman who has had a bastard, is said to have broken a leg.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Left-handed Wife * LeggersNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes