Definition of backstop noun from the Oxford Advanced American Dictionary

     

    backstop

     noun
    noun
    NAmE//ˈbækstɑp//
     
    (sport)
     
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  1. 1a fence or screen used to keep balls from going outside the playing area
  2. 2(informal) (in baseball) a catcher
See the Oxford Advanced Learner's Dictionary entry: backstop