Meaning of capper

cap•per

Pronunciation: (kap'ur), [key]
— n.
  1. a person or thing that caps.
  2. Also calledsomething that completes or adds to what has preceded it: The capper was that we didn't know each other after all.
  3. an informer, esp. for gamblers.
  4. a by-bidder at an auction.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.