Webster's English Dictionary

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backstop

1. back.stop \-.sta:p\ n : something at the back serving as a stop : as  : 
   a screen or fence (as behind home plate in baseball)  : a player (as the 
   catcher in baseball) whose position is behind the batt er : a stop (as a 
   pawl) that prevents a backward movement 
2. backstop vt 1: to serve as a backstop to  2: SUPPORT, BOLSTER