Definition of capper

• n. - One whose business is to make or sell caps.
• n. - A by-bidder; a decoy for gamblers [Slang, U. S.].
• n. - An instrument for applying a percussion cap to a gun or cartridge.
• n. - One whose business is to make or sell caps.
• n. - A by-bidder; a decoy for gamblers [Slang, U. S.].
• n. - An instrument for applying a percussion cap to a gun or cartridge.