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It was beginning to cloud over.

天空开始阴云密布。

《牛津词典》

The weather forecast says it will cloud over by mid-afternoon.

天气预报说下午三点左右会转阴。

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Air traffic over much of Europe came to a halt for six days because of the huge cloud of ash from a volcano in Iceland.

VOA: special.2010.04.23

A big cloud of smoke rose high in the air over Fort Sumter.

VOA: special.2009.08.13

A large fire then broke out, engulfing several shops and spewing a cloud of gray smoke over the area.

VOA: standard.2009.10.28

Wendell cited some recent statistics that would sort of cast a cloud over that view.

WHITEHOUSE: Press Briefing

Winds blew the cloud over northern France on Monday night and then into England.

BBC: Foul smell complaints in southern England after gas leak

One lingering cloud over global financial markets is the ongoing uncertainty about debt-plagued Europe.

FORBES: Economists Look For Bernanke To Keep 'Powder Dry' In Highly Anticipated Speech