In his armour, pot valiant: to fight in armour; to make use of Mrs. Philips’s ware. See .C—d—m.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Ard * ArkNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes