Definition of backstops:
(n) :
A default arrangement that holds if all else fails.
(n) :
An object or a person put in the rear or in the back of something to reinforce, hold, support.
(n) :
(baseball) A wall or fence behind home plate.
(n) :
(baseball, slang) A catcher; the position of catcher.
(n) :
(rounders) The player who stands immediately behind the striking base.
(v) :
(transitive) To bolster, support.