have a leg up on somebody
在某人面前占有优势，比某人占据更好的位置或更好的机会
口语·表达竞争优势
英文释义
to have an advantage or be ahead of someone else
例句
She studied all night, so she has a leg up on the rest of the class for the exam.
典故来源
源于赛马或骑马时借助外力上马，引申为占据优势地位。