What is "unhinging"

Usage examples of "unhinging".

Niemand-“ When Urbenton had used Deckard’s alias, the smile on the video director’s face had widened, like that of some reptile unhinging its jaws to swallow an entire goat in one mouthful.

There were times, the longest pauses, the slow hinging and unhinging of his jaw, the tentative sound echoing up his larynx, when he appeared to be on the verge of a torrential belch.

Seeing my superbaby, theoretically the most competent of us to deal with this emergency, sobbing like an ordinary infant now—well, it came close to unhinging me.