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to fog up
[phrase form: fog]
01
(of glass, mirrors, lenses, and other such surfaces) to become covered by fog
02
to cover something with very small water droplets, resulting in a mist on its surface
fog up
v
Example
The bathroom mirror fogged up after a hot shower.
The car windows fogged up in the early morning due to the temperature difference.
The camera lens started to fog up in the humid tropical climate.
Her glasses often fog up when she enters a warm room from the cold outdoors.
After the rain, the windshield of the car fogged up, reducing visibility.