Definition of buckle verb from the Oxford Advanced American Dictionary

     

    buckle

     verb
    verb
    NAmE//ˈbʌkl//
     
    Verb Forms present simple I / you / we / they buckle
     
    he / she / it buckles
     
    past simple buckled
     
    -ing form buckling
     
     
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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. Phrasal Verbsbuckle down (to something)buckle up
See the Oxford Advanced Learner's Dictionary entry: buckle