Definition
to negatively affect something that was previously positive or enjoyable; to spoil or taint a pleasant situation
给…蒙上阴影
Although they won the game, the controversy about their coach cast a shadow over the victory.
虽然他们赢得了比赛，但关于他们教练的争议给胜利蒙上了阴影。
The economic downturn has cast a shadow over the country’s future.
经济衰退给国家的未来蒙上了阴影。
Allegations about the company's past unethical practices cast a shadow over their new product launch.
关于公司过去不道德行为的指控给他们的新产品发布蒙上了阴影。