1. To change the criteria or standards of judgment unfairly after something has already started, making it impossible to meet the original expectations
The company keeps shifting the goalpost on project requirements, making it impossible to deliver on time.
A empresa continua mudando as regras do jogo sobre os requisitos do projeto, tornando impossível entregar no prazo.
2. To alter the terms of an agreement or challenge in the middle of proceedings
They agreed to a budget, but then shifted the goalpost by demanding additional features without extra pay.
Eles concordaram com um orçamento, mas depois moveram a trave ao exigir recursos adicionais sem pagamento extra.