backstop /ˈbæk.stɒp/noun 8verb 2forms 3 noun8 •An object or a person put in the rear or in the back of something to reinforce, hold, support. •A default arrangement that holds if all else fails. •Something serving to bolster or support a cover story etc.[…] to be set up in Indonesia with a phony book and school supplies company established in New York City as a backstop. — 1976 •A wall or fence behind home plate. •The player who stands immediately behind the striking base. •(slang) A catcher; the position of catcher. •(old-fashioned) The longstop. •(old-fashioned) The wicket-keeper. verb2 •To serve as backstop for. •To bolster, support.Russia signalled on Monday it would backstop the European Union's bailout of Cyprus despite anger that the weekend rescue deal would impose heavy losses on uninsured depositors, many of them Russian. — 2013 formsbackstopped · backstopping · backstops