fog

Fog is a hazy, cloudy layer of water vapor very that hovers close to the ground. Driving in fog feels a bit like being inside a cloud.

Fog is just what it appears to be — a cloud lying low in the atmosphere, getting its moisture from a body of water like the ocean or a river. When fog is thick, it can be dangerous to drive in, and most cars have special "fog lights" to help drivers see the road. When you're deeply confused, you can call it a fog too, and when things are unclear (literally or figuratively), they're said to fog up."

Definitions of fog
  1. noun
    droplets of water vapor suspended in the air near the ground
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    types:
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    fogbank
    a large mass of fog on the sea (as seen from a distance)
    ice fog, pogonip
    a dense winter fog containing ice particles
    mist
    a thin fog with condensation near the ground
    pea soup, pea-souper
    a heavy thick yellow fog
    type of:
    aerosol
    a cloud of solid or liquid particles in a gas
  2. noun
    an atmosphere in which visibility is reduced because of a cloud of some substance
    synonyms: fogginess, murk, murkiness
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    types:
    fug
    (British informal) an airless smoky smelly atmosphere
    type of:
    atmosphere, atmospheric state
    the weather or climate at some place
  3. noun
    confusion characterized by lack of clarity
    synonyms: daze, haze
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    type of:
    confusedness, confusion, disarray, mental confusion, muddiness
    a mental state characterized by a lack of clear and orderly thought and behavior
  4. verb
    make less visible or unclear
    synonyms: becloud, befog, cloud, haze over, mist, obnubilate, obscure
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    types:
    overshadow
    cast a shadow upon
    eclipse, occult
    cause an eclipse of (a celestial body) by intervention
    type of:
    conceal, hide
    prevent from being seen or discovered
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