the.com/hinge

the unsung hero letting doors swing while taking zero credit for the entrance

means the jointed device that lets a door, lid, or gate pivot open and shut while staying fixed to its frame.

from From Middle English 'henge,' meaning that on which something hangs or turns — closely tied to the verb 'hang' (Old English 'hangian'). The word and the action share a root: a hinge is literally the thing a door 'hangs' upon.

oldest design
Used on Egyptian doors over 5,000 years ago
body part
Your knee and jaw are biological hinges
dating app
Brands itself as designed to be deleted
history pivot
The phrase hinges on means everything depends on it
hidden everywhere
Laptops, glasses, and clamshell phones all rely on them
for instance

hinge joint knee — human anatomy: tibia and femur connect with 140-degree flexion range

door hinge butt type — carpentry standard: mortised metal hinge allowing 180-degree swing on residential doors

hinge dating app — founded 2012, marketed as 'the dating app designed to be deleted' with 4+ million users

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