move the goalposts idiom UK informal disapproving
改变规则，改变条件（使某人为难）
to change the rules while someone is trying to do something in order to make it more difficult for them
We'd almost signed the contract when the other guys moved the goalposts and said they wanted more money. 我们几乎就要签合同了，可就在这时对方那些家伙又出了难题，说他们得加价。