buckle

1. N-COUNT A buckle is a piece of metal or plastic attached to one end of a belt or strap, which is used to fasten it. (皮带等的) 带扣

He wore a belt with a large brass buckle. 他系了一根有很大黄铜扣的皮带。

2. V-T When you buckle a belt or strap, you fasten it. 扣紧

A door slammed in the house and a man came out buckling his belt. 屋子里门砰地关上了，一名男子一边扣着皮带一边走了出来。

3. V-T/V-I If an object buckles or if something buckles it, it becomes bent as a result of very great heat or force. 使弯曲; (因受热或受压而) 变弯

The door was beginning to buckle from the intense heat. 由于高温，门正开始变弯。

4. V-I If your legs or knees buckle, they bend because they have become very weak or tired. (腿、膝) 发软弯曲

Mcanally's knees buckled and he crumpled down onto the floor. 麦卡纳利双膝发软弯了下去，瘫倒在地板上。