Buckle

A device, usually of metal, consisting of a frame with one more movable tongues or catches, used for fastening things together, as parts of dress or harness, by means of a strap passing through the frame and pierced by the tongue.

A distortion bulge, bend, or kink, as in a saw blade or a plate of sheet metal.

A curl of hair, esp. a kind of crisp curl formerly worn; also, the state of being curled.

A contorted expression, as of the face.

To fasten or confine with a buckle or buckles; as, to buckle a harness.

To bend; to cause to kink, or to become distorted.

To prepare for action; to apply with vigor and earnestness; -- generally used reflexively.

To join in marriage.

To bend permanently; to become distorted; to bow; to curl; to kink.

To bend out of a true vertical plane, as a wall.

To yield; to give way; to cease opposing.

To enter upon some labor or contest; to join in close fight; to struggle; to contend.

fold or collapse; "His knees buckled"