He lost confidence and backed out of the deal at the last minute.

他失去了信心，在最后一刻退出了协议。

《牛津词典》

Papen lost a confidence vote in August, and his government fell after losing in the fourth election in a year in November.

帕彭在8月失去了一次信任投票，他的政府在11月的第四次选举中失败后垮台。

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Her coach left her and she lost confidence.

WSJ: How to Build a Tennis Empire

After losing the second set I really went down and lost all my confidence.

BBC: Safin books meeting with Federer

And as a consequence, his performance levels dropped and he lost his confidence in front of goal.

BBC: Sport Academy | Football | Features | David Healy