To hinge upon it
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If one thing hinges on another, the first thing depends on the second thing or is very influenced by it:
To hinge upon it meaning & definition 1 of To hinge upon it.
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If a story or situation hinges on an idea or subject, it develops from that idea or that is the most important subject in it:
To hinge upon it meaning & definition 2 of To hinge upon it.
