buckle

Noun

• a shape distorted by twisting or folding

• fastener that fastens together two ends of a belt or strap; often has loose prong

Verb

• bend out of shape, as under pressure or from heat
  • The highway buckled during the heat wave
    

• fold or collapse
  • His knees buckled
    

• fasten with a buckle or buckles

Related words

• Synonyms: 
  warp , heave , crumple , clasp