buckle down 全力以赴;倾全力

【例句】
The only way we'll meet the schedule is to buckle down and get on with the job.
我们要完成计划的唯一办法是全力以赴，继续工作。

You have to buckle down and learn what's in this manual.
你必须全力以赴，学习手册上的知识。