Collins COBUILD Advanced Learner's English Dictionary - goalpost

also goal post (goalposts) 1. A goalpost is one of the two upright wooden posts that are connected by a crossbar and form the goal in games such as football and rugby. N-COUNT 2. If you accuse someone of moving the goalposts, you mean that they have changed the rules in a situation or an activity, in order to gain an advantage for themselves and to make things difficult for other people. They seem to move the goal posts every time I meet the conditions which are required. PHRASE: V inflects c darkgreen]disapproval