move the goalposts
改变规则或目标以使事情更加有利于自己
口语·表达不公平改变规则
英文释义
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.
典故来源
源自足球运动，指比赛中移动球门位置，比喻不公平地改变规则或目标。