如果你 “get your head down（把你的头低下来）”，意思就是 “你把全部的精力集中在一项特定的任务上，全力以赴”。“Get your head down” 也可以表示 “躺下睡觉”。

例句
I need to get my head down and finish my homework – I have got so much to do.
我得全力以赴，完成作业。我还有很多作业要做。

Working at home means I can get my head down and get my work done without any distractions.
在家工作意味着我能专心致志、不受干扰地完成工作。

It’s already past midnight! I’d better get my head down.
已经过了半夜了！我该睡了。