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backstop (n.)

1819, "something at the back as a barrier;" see back (adj.) + stop (n.). In U.S. baseball, from 1889, "fence a short distance behind the catcher;" figurative extension to "catcher on a baseball team" is from 1890. The verb is attested from 1956 in the sense of "support." Related: Backstopped; backstopping.

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Definitions of backstop from WordNet
1
backstop (n.)
(baseball) the person who plays the position of catcher;
Synonyms: catcher
backstop (n.)
(baseball) a fence or screen (as behind home plate) to prevent the ball from traveling out of the playing field;
backstop (n.)
a precaution in case of an emergency;
he acted as a backstop in case anything went wrong
2
backstop (v.)
act as a backstop;
From wordnet.princeton.edu