fog up
Get covered in mist or steam so you can't see through it — like glasses or a car windscreen.
Meanings
Of a glass surface, to become covered in condensation so that it is difficult or impossible to see through.
"My glasses fogged up the moment I walked into the warm kitchen from the cold."
To cause a surface to become obscured with condensation or mist.
"The hot shower fogged up the bathroom mirror completely."
Most commonly used for glasses, mirrors, car windscreens, and windows. Very frequent in everyday British English. Can be intransitive ('my glasses fogged up') or transitive ('the steam fogged up the mirror'). American English more often uses 'fog up' or 'steam up' interchangeably.
Commonly used with
Forms
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