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[kap-er] /ˈkæp ər/
a person or thing that caps.
Also called topper. something that completes or adds to what has preceded it:
The capper was that we didn't know each other after all.
Slang. an informer, especially for gamblers.
Slang. a by-bidder at an auction.
Origin of capper
1350-1400 (for sense “cap maker”); 1580-90 (for def 1); Middle English; see cap1, -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for capper
Contemporary Examples
Historical Examples
  • As a capper he digs up that envelop, to show her there needn't be any hitch in the program.

    Shorty McCabe Sewell Ford
  • It is amazing the many who were willing to play the part of capper in this game.

    Watch Yourself Go By Al. G. Field
  • Rawlinson reported that capper with two brigades was still in Ghent.


    John French, Viscount of Ypres
  • He is a sort of bouncer, or capper for that gambling joint run by Plimsoll.

    Rimrock Trail J. Allan Dunn
  • capper (appearing quietly from room L., and locking the door behind him).

  • I came to tell you, Alexander, capper has explained all about—about the decoy!

  • "But, capper—you remember me, capper; I was your master's friend," went on the girl despairingly.

    Dead Man's Love Tom Gallon
Slang definitions & phrases for capper



  1. A huckster's or professional gambler's helper, who attracts clients; shill (1750s+)
  2. The climax or end of something (1940s+)
  3. A story, joke, etc, that outdoes another one (1940s+)
The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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