fog up

— phrasal verb with fog

/fɒɡ/

/fɑːɡ/ verb [T] (-gg-)

Definition

› 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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