Dictionary 1. (n.) One whose business is to make or sell caps.2. (n.) A by-bidder; a decoy for gamblers [Slang, U. S.]. 3. (n.) An instrument for applying a percussion cap to a gun or cartridge. Thesaurus agitator agitprop capper catalyst come-on man decoy demagogue exciter firebrand fomenter incendiary inciter inflamer instigator mischief-maker plant provocateur provoker rabble-rouser ringleader rouser seditionary seditionist shill stool pigeon stoolie troublemaker urger |