buckle

noun

fastener that fastens together two ends of a belt or strap
a shape distorted by twisting or folding

warp

verb

to bend out of shape, as under pressure or from heat
“The highway buckled during the heat wave.”
heave
to fold or collapse
“Your knees buckled under the weight of the metal beams.”
crumple
to fasten with a buckle or buckles
“I buckle my seatbelt.”
clasp