(countable) A clasp used for fastening two things together, such as the ends of a belt, or for retaining the end of a strap.

(Canada, heraldry) The brisure of an eighth daughter.

(roofing) An upward, elongated displacement of a roof membrane frequently occurring over insulation or deck joints. A buckle may be an indication of movement with the roof assembly.

A distortion, bulge, bend, or kink, as in a saw blade or a plate of sheet metal.

A curl of hair, especially a kind of crisp curl formerly worn; also, the state of being curled.

A contorted expression, as of the face.

(US, baking) A cake baked with fresh fruit and a streusel topping.

(intransitive) To distort or collapse under physical pressure; especially, of a slender structure in compression.

(transitive) To make bend; to cause to become distorted.

(intransitive, figurative) To give in; to react suddenly or adversely to stress or pressure (of a person).

(intransitive) To yield; to give way; to cease opposing.

To buckle down; to apply oneself.

(transitive) To fasten using a buckle.

(Scotland) To unite in marriage.