| Noun | 1. | buckle - fastener that fastens together two ends of a belt or strap; often has loose prongprong - a pointed projection | |
| 2. | buckle - a shape distorted by twisting or folding | |
| Verb | 1. | buckle - fasten with a buckle or bucklesfasten, fix, secure - cause to be firmly attached; "fasten the lock onto the door"; "she fixed her gaze on the man" unbuckle - undo the buckle of; "Unbuckle your seat belt" | |
| 2. | buckle - fold or collapse; "His knees buckled"cave in, collapse, fall in, give way, founder, give, break - break down, literally or metaphorically; "The wall collapsed"; "The business collapsed"; "The dam broke"; "The roof collapsed"; "The wall gave in"; "The roof finally gave under the weight of the ice" | |
| 3. | buckle - bend out of shape, as under pressure or from heat; "The highway buckled during the heatwave"lift - rise upward, as from pressure or moisture; "The floor is lifting slowly" | |