Meaning of backstop

Definition of backstop

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

Other information on backstop

WIKIPEDIA results for backstop
Amazon results for backstop