Definition of "hinge on" [hinge on]

• To depend on, depend upon, be contingent upon (verb)

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• "All at once Lord Luxon questioned Alice’s counterfactual advice, for how could the fate of such a powerful nation hinge on the outcome of one reckless attempt to cross a river?"
• "The case, then, would hinge on whether the Gottsdankers could show that Cutter had violated what in legal terms is referred to as an “implied warranty.”"