/ˈbʌkl ||; ˈbʌkḷ/noun [C] a piece of metal or plastic at the end of a belt or strap that is used for fastening it （皮带、吊带等的）扣环 ☞pictures at bag, button and shoe 见bag、button及shoe插图
buckle²
/ˈbʌkl ||; ˈbʌkḷ/verb[I,T]
1 to fasten or be fastened with a buckle （用扣环）扣住
2 to bend because of heat, force, weakness, etc （受热、受压等而）弯曲: Some railway lines buckled in the heat.有些火车轨道受不住高热而弯曲。