Hinges

A jointed or flexible device that allows the pivoting of a door etc.

A naturally occurring joint resembling such hardware in form or action, as in the shell of a bivalve.

A stamp hinge, a folded and gummed paper rectangle for affixing postage stamps in an album.

A principle, or a point in time, on which subsequent reasonings or events depend.

"This argument was the hinge on which the question turned."

To attach by, or equip with a hinge.

(with on or upon) To depend on something.

The breaking off of the distal end of a knapped stone flake whose presumed course across the face of the stone core was truncated prematurely, leaving not a feathered distal end but instead the scar of a nearly perpendicular break.

"The flake hinged at an inclusion in the core."

To bend.