underachieved

I think they underachieved more than anyone, especially with Andrew Bogut developing.

我认为他们完全没有发挥出应有的实力，而且博格特还在进步。

We underachieved at this World Cup and the fact that we never played good football, like we can, is an added downer.

我们没有取得这次世界杯，事实是我们从来没有尽力打过一场好比赛，这让人十分扫兴。