Fog over - Idioms by The Free Dictionary
To become obscured by fog. My glasses fogged over while I was in the shower—I can't see a thing!
[for something made of glass] to become covered over with water vapor. The windshield fogged over because I forgot to turn on the defroster. The mirror fogged over, and I couldn't see to shave.
References in periodicals archive
Harbhajan dismissed Matt for two and Broad for one in his first two overs after England had resumed on 282 for six in the morning following a two-hour delay caused by fog over
As the air cools, the moisture condenses into fog over
the hill tops.