backstop

Noun
  1. (baseball) the person who plays the position of catcher (synset 109920596)
  2. (baseball) a fence or screen (as behind home plate) to prevent the ball from traveling out of the playing field (synset 102774552)
  3. A precaution in case of an emergency (synset 100178487)
    "he acted as a backstop in case anything went wrong"
Verb
  1. Act as a backstop (synset 201078523)

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