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fog

noun [C or U] (WEATHER)
 
 
/fɒɡ/ US  /fɑːɡ/

Definition

A2 a weather condition in which very small drops of water come together to form a thick cloud close to the land or sea, making it difficult to see: Thick/Heavy/Dense fog has made driving conditions dangerous. Mists, freezing fogs and snow are common in this area. It took several hours for the fog to lift.Clouds, dew, fog and steam
(Definition of fog noun (WEATHER) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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