buckle up ( buckling, buckled, buckles )

• 1. 

  PHRASAL VERB When you buckle up in a car or aeroplane, you fasten your seat belt. 系上安全带 [非正式]

  例：

  A sign just ahead of me said, "Buckle Up. It's the Law in Illinois."

  在我前面的一个告示牌上写着“系上安全带，这是伊利诺伊州的法律”。