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English definition of “fog up”

fog up

phrasal verb with fog     /fɒɡ/ US  /fɑːɡ/ verb [T] (-gg-)
If a glass surface fogs up, a thin layer of liquid develops on it so that it is difficult to see through: I couldn't see a thing because my glasses had fogged up.Clouds, dew, fog and steam
(Definition of fog up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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