have a leg up on somebody
在某人面前占有優勢，比某人占據更好的位置或更好的機會
口語·表達競爭優勢
英文釋義
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.
典故來源
源于賽馬或騎馬時借助外力上馬，引申為占據優勢地位。