buckle

(noun) fastener that fastens together two ends of a belt or strap; often has loose prong.

(noun) a shape distorted by twisting or folding. Synonyms: warp.

(verb) fasten with a buckle or buckles. Synonyms: clasp.

(verb) fold or collapse. Synonyms: crumple. Example: "His knees buckled."

(verb) bend out of shape, as under pressure or from heat. Synonyms: heave, warp. Example: "The highway buckled during the heat wave."