Definitions from Wiktionary (Backstop)

▸ noun:  A thing or a person put in the rear or in the back of something to reinforce, hold, support.
▸ noun:  A default arrangement that holds if all else fails.
▸ noun:  (baseball) A wall or fence behind home plate.
▸ noun:  (baseball, slang) A catcher; the position of catcher.
▸ noun:  (rounders) The player who stands immediately behind the striking base.
▸ noun:  (cricket, dated) The longstop.
▸ noun:  (cricket, dated) The wicket-keeper.
▸ noun:  (espionage) Something serving to bolster or support a cover story etc.
▸ verb:  (transitive) To serve as backstop for.
▸ verb:  (transitive) To bolster, support.
▸ noun:  (UK) A proposed seamless border between Ireland and Northern Ireland in the event of Brexit.
▸ Also see backstop

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