hinge

• n. 蝶番、折り目; 鍵、回転点; 枢軸、ピボット
• v. 蝶番でつなぐ；蝶番でつなぐ；蝶番でつなぐ；（ドアなどを）蝶番でつなぐ

PIE*konkのhangingが語源で、語源的にはhangと同じ。

hinge

hinge: [13] Hinge is generally agreed to be related to the verb hang, and to mean etymologically ‘something on which a door hangs’, but the circumstances of its formation are obscure (as indeed are the reasons for its rhyming with singe, a 16th-century development; before that it rhymed with sing).
=> hang

hinge (n.)

c. 1300, "the axis of the earth;" late 14c. as "movable joint of a gate or door," not found in Old English, cognate with Middle Dutch henghe "hook, handle," Middle Low German henge "hinge," from Proto-Germanic *hanhan (transitive), *hangen (intransitive), from PIE *konk- "to hang" (see hang (v.)). The notion is the thing from which a door hangs.

hinge (v.)

c. 1600, "to bend," from hinge (n.). Meaning "turn on, depend" is from 1719. Related: Hinged; hinging.

1. Fit hinge bolts to give extra support to the door lock.

ヒンジピンを取り付けて、ドアロックをより強固にします。

2.Running water is never stale and a door- hinge never gets worm-eaten.

流水は腐らず、枢.

3.Does not success or failure hinge on this？

成否の機は、ここにあるのだろうか。

4.The hinge is insecure.

このヒンジは緩んでいる.

5.A door turns on its hinge .

ドアは、ドアのピボットによって回転する。