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

     

    buckle

     verb
    verb
    BrE BrE//ˈbʌkl//
     
    ; NAmE NAmE//ˈbʌkl//
     
    Verb Forms present simple I / you / we / they buckle
    BrE BrE//ˈbʌkl//
     
    ; NAmE NAmE//ˈbʌkl//
     
    he / she / it buckles
    BrE BrE//ˈbʌklz//
     
    ; NAmE NAmE//ˈbʌklz//
     
    past simple buckled
    BrE BrE//ˈbʌkld//
     
    ; NAmE NAmE//ˈbʌkld//
     
    past participle buckled
    BrE BrE//ˈbʌkld//
     
    ; NAmE NAmE//ˈbʌkld//
     
    -ing form buckling
    BrE BrE//ˈbʌklɪŋ//
     
    ; NAmE NAmE//ˈbʌklɪŋ//
     
     
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  1. 1[transitive, intransitive] to fasten something or be fastened with a buckle buckle (something) She buckled her belt. buckle (something on/up) He buckled on his sword. These shoes buckle at the side.
  2. 2[intransitive, transitive] to become crushed or bent under a weight or force; to crush or bend something in this way The steel frames began to buckle under the strain. (figurative) A weaker man would have buckled under the pressure. buckle something The crash buckled the front of my car.
  3. 3[intransitive] when your knees or legs buckle or when you buckle at the knees, your knees become weak and you start to fall
  4. 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’. Phrasal Verbsbuckle down (to something)buckle up
See the Oxford Advanced American Dictionary entry: buckle