What Is a Hinged Door?

In this expression, big blow, we're not referring to air or to punches, are we? There's no boxing involved. A so what we're talking about here is an unexpected event that has a devastating effect and it's a massive impact. So our next headline comes from the telegraph - y e's future hinges on the french election result. Hinges on depends on something happening. And without those hinges, the door doesn't work.