Head start 指“竞赛或赛跑中的先起步优势”，通常与介词 on 或 over 搭配。Get a head start 的意思是“有个领先开端或者领先一步”; get a head start on/over somebody 的意思是“在开始时就比其他人更有优势，领先于他人”。

例句

Go to sleep early, so you can get a head start tomorrow.

早点睡，养足精神，明天才会有个好开端。

You've got a head start on this project, because you've done this before.

这个项目上你占先机，因为你做过类似的项目。

Simon got a head start in the cycling race because Peter lost his footing at the start.

西蒙在自行车比赛一开始就占了上风是因为彼得在起跑线上就失误了。