'Backstop' definitions:

Definition of 'backstop'

(from WordNet)
noun
(baseball) the person who plays the position of catcher [syn: catcher, backstop]
noun
(baseball) a fence or screen (as behind home plate) to prevent the ball from traveling out of the playing field
noun
A precaution in case of an emergency; "he acted as a backstop in case anything went wrong"
verb
Act as a backstop

Definition of 'Backstop'

From: GCIDE
  • Backstop \Back"stop`\, n.
  • 1. In baseball, a fence, prop. at least 90 feet behind the home base, to stop the balls that pass the catcher; also, the catcher himself. [Webster 1913 Suppl.]
  • 2. In rounders, the player who stands immediately behind the striking base. [Webster 1913 Suppl.]
  • 3. In cricket, the longstop; also, the wicket keeper. [Webster 1913 Suppl.]