Webster's English Dictionary

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stopper

1. stop.per \'sta:p-*r\ n 1: one that brings to a halt or causes to stop 
   operating or functioning :  CHECK 2: one that closes, shuts, or fills up; 
   specif : something (as a bu ng or cork) used to plug an opening
2. stopper \-(*-)rin\ vt or stop.per.ing : to close or secure with or as if 
   with a stopper