The Collaborative International Dictionary of English v.0.48:

Choke pear \Choke" pear`\
   1. A kind of pear that has a rough, astringent taste, and is
      swallowed with difficulty, or which contracts the mucous
      membrane of the mouth.
      [1913 Webster]

   2. A sarcasm by which one is put to silence; anything that
      can not be answered. [Low] --S. Richardson.
      [1913 Webster]