Having a hinge or hinges; connected by a joint that allows movement; dependent on something critical.
From Middle English henge, related to 'hang'. The mechanical device evolved from the concept of hanging doors or gates. The metaphorical use meaning 'dependent on' developed from the idea that success 'hangs on' or is 'hinged on' crucial factors.
The phrase 'hinged on' beautifully captures how crucial decisions work like door hinges - small movements that can swing wide to create large changes. This mechanical metaphor shows how we understand abstract concepts through physical analogies.
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