- cloud over
- cloud over1. Lit. [for the sky] to fill with clouds; [for the sun] to be obscured by clouds. •
It was beginning to cloud over, so we went inside.
•The sky clouded over and it began to get chilly.
2. Fig. [for something once clear] to become opaque; to become clouded. •My vision seemed to cloud over, and I could see very little.
•The mirror clouded over as the steam rose from the hot water in the sink.
Dictionary of American idioms. 2013.