shift the goalposts
成語所屬單字shift
shift the goalposts — 慣用語
1. to change the rules or requirements of something while it is happening, making i
1.慣用語
釋義
改變規則；換了說法
to change the rules or requirements of something while it is happening, making it harder for someone to succeed.
例句
Just when the team thought they had met all the targets, the boss shifted the goalposts again.
In negotiations, it is unfair to shift the goalposts after the other side has already agreed.