hinge
verb
hinged; hinging
1
: to swing on or as if on a hinge
These thoughtful amenities include … an outdoor patio TV that hinges outward toward the pool …—
Paul Takahashi
… we pulled within feet of a 12-foot crocodile, his huge jaw hinging open in warning to reveal a toothy grin.—
Andrea Bartz
2
: to be contingent on a single consideration or point
—used with on or upon
the prosecution's case hinges on the DNA evidence
: to attach by or furnish with hinges
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Merriam-Webster unabridged



