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 designUsed on Egyptian doors over 5,000 years ago
body partYour knee and jaw are biological hinges
dating appBrands itself as designed to be deleted
history pivotThe phrase hinges on means everything depends on it
hidden everywhereLaptops, glasses, and clamshell phones all rely on them