Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. One that caps or makes caps.
  • n. Informal Something that surpasses or completes what has gone before; a finishing touch or finale.
  • n. Slang One who acts as a decoy, as in a confidence game.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. One that caps.
  • n. A device or person that applies caps, as to bullets or bottles.
  • n. A person that makes or sells caps.
  • n. A finale.
  • n. A by-bidder; a decoy for gamblers.

from the GNU version of the Collaborative International Dictionary of English

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

from The Century Dictionary and Cyclopedia

  • n. One whose business is the making or selling of caps.
  • n. A tool for fitting percussion-caps to shells.
  • n. A Scotch form of cupper, a cupbearer.
  • To seize; lay hold of violently: specifically, to seize (a vessel) as a prize.
  • n. A spider.
  • n. A stool-pigeon in a gambling-house, or a person employed at auctions to raise bids deceptively.
  • n. The workman who takes the filled molds away from a brick-machine.

Etymologies

cap +‎ -er (Wiktionary)

Examples

  • The capper is a 7-yard pass to Wes Welker, putting New England up early, and planting that seed of doubt into the minds of Broncos fans.

    New England Patriots 45 Denver Broncos 10 - as it happened!

  • The capper is a deposition that was given by the cameraman for the footage some years ago.

    Marshall Fine: HuffPost Review: A Film Unfinished

  • The capper is a call that Jimmy says he made to Johnny at home that night because “Greenberg was a meatpacker who was treating him like a piece of dirt.”

    The Rise and Fall of Bear Stearns

  • And the capper is the whole "never admit fault" attitude that seems to permeate the Blogger/Google organization.

    I hate Blogger.

  • When they report that over 7 million unique users log in to HH every month, that to me is still questionable but also more significant -- and the capper is the ultimate commercial quantification, that they report unaudited over $30M in revenue last year.

    The future of VWs over a quarter

  • "Yes; what the gamblers call a capper, or roper-in."

    Madeline Payne, the Detective's Daughter

  • They were, respectively, "Doc" Curfoot -- suave haunter of Peacock Alley and gentleman "capper" -- whom Brandes introduced as the celebrated specialist, Doctor Elbert Curfoot -- and Captain Harman

    The Dark Star

  • The capper was a series of stories about his relationship with a former Penthouse Pet who now works at a St. Louis bartender.

    KansasCity.com: Front Page

  • The capper might be a hay-smoked length of bone-in fish on a tumble of pan-crisped okra and tomato, an ode to the new Gulf Coast.

    chron.com Chronicle

  • The capper was a three-run homer by Young that broke open the game and gave the Pirates an 8-3 advantage.

    JSOnline.com

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