Green’s Dictionary of Slang

merchant n.

[mid-16C–18C; 20C+] a man, a fellow, esp. as an adept of a particular interest, [20C+] use is usu. in a variety of qualifying combs., e.g. blag-merchant under blag n.; bull merchant under bull n.6 ; caper merchant under caper n.2 ; fanny merchant under fanny n.2 ; feather merchant under feather n.; hoist-merchant under hoist n.; hop merchant under hop n.1 ; jump-up merchant under jump-up n.; lay-down merchant n.; lush merchant under lush n.1 ; mutton merchant under mutton n.; reader merchant under reader n.; timber-merchant under timber n.; tootle-merchant under tootle n.; wood merchant under wood n.1 .