"buckle" in the noun sense
fastener that fastens together two ends of a belt or strap often has loose prong
2. warp, buckle
a shape distorted by twisting or folding
"buckle" in the verb sense
1. buckle, clasp
fasten with a buckle or buckles
2. buckle, crumple
fold or collapse
"His knees buckled"
3. heave, buckle, warp
bend out of shape, as under pressure or from heat
"The highway buckled during the heat wave"
Source: WordNet® (An amazing lexical database of English)
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