v. 〔因高温或压力〕（使）弯曲；（使）变形

v. 〔膝盖或腿〕发软

v.  屈服，让步 ≈ give in

v.  用扣环扣住[扣紧]

n. 〔皮带等的〕金属扣环，扣子；带扣

• buckle down  开始认真做；埋头干

• buckle up  系上安全带

• John felt his knees start to buckle.

  约翰觉得膝盖开始发软了。

• A weaker person would have buckled under the weight of criticism.

  意志薄弱的人在这样的批评下也许已经垮了。

• Amy buckled the belt around her waist.

  埃米把腰带扣在腰上。

• You’d better buckle down to some revision now. 你现在最好坐下来好好复习。