A clasp on a belt or strap for fastening.

• A similar fastening device on shoes, bags, or equipment.

To fasten with a buckle, especially a belt or strap.

• To attach a seat belt.

To bend, warp, or give way under pressure or heat.

• To collapse or distort structurally.

To yield or give in under stress or persuasion.

• To lose resolve.

To set to work seriously; apply oneself.

• Often in buckle down.

A bend, bulge, or kink in a surface or material.

• A buckle in a road, track, or floor.