Cloud over is a common phrase used to describe situations that turn sour or gloomy. However, there are numerous synonyms available to spice up your vocabulary and add more variety to your language usage. Some synonyms for cloud over include darkening, overshadowing, dimming, obscuring, veiling, dampening, and lowering. These words all convey a sense of negativity and can be used interchangeably with cloud over to describe situations where things take a turn for the worse. Additionally, using synonyms in your writing can help paint a more vivid picture for your readers and create a more engaging piece of content.