It seemed like a good idea at the time , and then it all went horribly wrong.

那在当时似乎是个好主意，但后来却铸成大错。

《牛津词典》

Investors were left scratching their heads and empty wallets, and numerous individuals and businesses to this day are still wondering what happened, and how it all went wrong so quickly.

投资者们留下了苦苦的思索和空空的钱包，还有很多的个人以及企业至今仍然不知道发生了什么，为什么一切都破灭得如此之快。

youdao

And looking back, we cannot know the precise time and place that it all went wrong.

如果回头看，我们却不知道事情开始出错的确切时间和地点。

youdao

His rival Jorge Lorenzo was just trying too hard on the first corner in Australia and it all went wrong for him.

BBC: Steve Parrish's MotoGP column

And then, it all went terribly wrong.

WSJ: Tebow left to wonder what's next after cut by Jets

I, for one, would like to hear Lineker, Hanson and Gazza on where it all went right or wrong - not on the pitch but in the examination hall.

BBC: A game of two halves