LOCK,
as, He stood a queer Lock; i.e. He stood an indifferent Chance, &c.
as, He stood a queer Lock; i.e. He stood an indifferent Chance, &c.
Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
Lock in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).