Phrasal Verb: Hinge on
Depend very much or completely
Example:Everything HINGES ON the results of the negotiations; if they go badly, we'll be in real trouble.
Be an essential point for the development of a story
Example:The film HINGES ON his not being recognised when he's in disguise.
Other Phrasal Verbs
We have 2 phrasal verbs with 'HINGE'