Meaning of “fog up” in the English Dictionary

british dictionary

"fog up" in British English

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fog up

phrasal verb with fog uk /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.

(Definition of “fog up” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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