fog - definition and synonyms

 
noun 

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/fɒɡ/
  1. 1
    [countable/uncountable] a thick cloud that forms close to the ground or to water and is difficult to see through. Fog is thicker than mist
    thick/heavy/dense/freezing fog:

    Heavy fog forced drivers to slow down.

    a patch of fog:

    There may be some patches of fog around dawn.

    a blanket of fog (=fog that covers everything):

    a thick blanket of fog in the valley

    fog lifts (=goes away):

    We’ll leave when this fog has lifted.

  2. 2
    [singular] a cloud of smoke or some other gas
    fog of:

    a fog of cigar smoke

  3. 3
    [singular] a confused or confusing situation or state
    in a fog:

    My mind’s in a complete fog.

    fog of:

    She shook off the fog of sleep.