Conversation

@sixohsix When you're throwing or firing things at a target, a backstop is a thing that catches or blocks any projectiles that miss or pass through the target. Like in a firearms shooting range, or a baseball practice area. In the case of Brexit I think this word is being used as a metaphor to indicate "last resort" - if they can't resolve the Irish border issue, the "backstop" will catch the unhandled cases.