buckle
bucklebuckle[ˈbʌk(ə)l],buckle 'down (to sth) (informal) 1.■to start working or doing sth in a serious or determined way开始认真做；努力干:He tried to buckle down to some work/study.他努力静下心来认真工作/学习。[synonym]knuckle down (to sth)[G]v+adv,buckle 'up (especially AmE)2.■to fasten the belt that you wear in a car, etc. to keep you in your seat if there is an accident (a seat belt) 系上安全带:Buckle up, kids.孩子们，系好安全带。[synonym]belt up (BrE)[G]v+adv
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