Definition of buckle noun from the Oxford Advanced Learner's Dictionary

 

buckle

 noun
noun
BrE BrE//ˈbʌkl//
 
; NAmE NAmE//ˈbʌkl//
 
Parts of clothing
 
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a piece of metal or plastic used for joining the ends of a belt or for fastening a part of a bag, shoe, etc. a tall black hat with a silver buckle in front See related entries: Parts of clothing Word Origin Middle English: from Old French bocle, from Latin buccula ‘cheek strap of a helmet’, from bucca ‘cheek’. Senses (2 and 3) are from French boucler ‘to bulge’.
See the Oxford Advanced American Dictionary entry: buckle