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to fog up
[phrase form: fog]
01
(of glass, mirrors, lenses, and other such surfaces) to become covered by fog
Example
The bathroom mirror fogged up after a hot shower.
Her glasses often fog up when she enters a warm room from the cold outdoors.
02
to cover something with very small water droplets, resulting in a mist on its surface
Example
A cold drink can cause the outside of the glass to fog up on a warm day.
My breath makes the mirror fog up after a hot shower.
