DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   stopper
       n 1: an act so striking or impressive that the show must be
            delayed until the audience quiets down [syn: show-
    stopper, showstopper, stopper]
       2: a remark to which there is no polite conversational reply
          [syn: conversation stopper, stopper]
       3: (bridge) a playing card with a value sufficiently high to
          insure taking a trick in a particular suit; "if my partner
          has a spade stopper I can bid no trump"
       4: blockage consisting of an object designed to fill a hole
          tightly [syn: plug, stopper, stopple]
       v 1: close or secure with or as if with a stopper; "She
            stoppered the wine bottle"; "The mothers stoppered their
            babies' mouths with pacifiers" [syn: stopper, stopple]