Moving the goalposts (or shifting the goalposts) is a metaphor, derived from goal-based sports, that means to change the criterion (goal) of a process or competition while it is still in progress, in such a way that the new goal offers one side an advantage or disadvantage.

Why do narcissists move the goalposts?

Abusive narcissists and sociopaths employ a logical fallacy known as “moving the goalposts” in order to ensure that they have every reason to be perpetually dissatisfied with you.

What is meant by shifting the goalposts?

: to change the rules or requirements in a way that makes success more difficult.