buckle in WordNet English dictionary

1. fastener that fastens together two ends of a belt or strap; often has loose prong
   buckle 
   
2. a shape distorted by twisting or folding
   warp  buckle 
   

1. bend out of shape, as under pressure or from heat
   "The highway buckled during the heat wave"
   heave  buckle  warp 
   
2. fasten with a buckle or buckles
   buckle  clasp 
   
3. fold or collapse
   "His knees buckled"
   buckle  crumple