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

n droplets of water vapor suspended in the air near the ground

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a large mass of fog on the sea (as seen from a distance)
ice fog, pogonip
a dense winter fog containing ice particles
a thin fog with condensation near the ground
pea soup, pea-souper
a heavy thick yellow fog
Type of:
a cloud of solid or liquid particles in a gas

n an atmosphere in which visibility is reduced because of a cloud of some substance

fogginess, murk, murkiness
(British informal) an airless smoky smelly atmosphere
Type of:
atmosphere, atmospheric state
the weather or climate at some place

n confusion characterized by lack of clarity

daze, haze
Type of:
confusedness, confusion, disarray, mental confusion, muddiness
a mental state characterized by a lack of clear and orderly thought and behavior

v make less visible or unclear

becloud, befog, cloud, haze over, mist, obnubilate, obscure
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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