move the goalposts
改變規則或目標以使事情更加有利于自己
口語·表達不公平改變規則
英文釋義
to change the rules or requirements of a situation or agreement in order to make it more difficult for someone to succeed or achieve their goal
例句
Every time I meet one requirement, my boss moves the goalposts again.
典故來源
源自足球運動，指比賽中移動球門位置，比喻不公平地改變規則或目標。