GNU Collaborative International Dictionary of English

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  1.       
    Capper (?), n.
    1. One whose business is to make or sell caps.

    [1913 Webster]


    2. A by-bidder; a decoy for gamblers. [Slang, U. S.]

    [1913 Webster]


    3. An instrument for applying a percussion cap to a gun or cartridge.

    [1913 Webster]