1
a
: vapor condensed to fine particles of water suspended in the lower atmosphere that differs from cloud only in being near the ground
b
: a fine spray or a foam for firefighting
2
: a murky condition of the atmosphere or a substance causing it
3
a
: a state of confusion or bewilderment
spent the morning in a fog
b
: something that confuses or obscures
hid behind a fog of rhetoric
4
: cloudiness or partial opacity in a developed photographic image caused by chemical action or stray radiation
fogged; fogging
1
: to cover, envelop, or suffuse with or as if with fog
fog the barns with pesticide
2
: to make obscure or confusing
accusations which fogged the real issues
3
: to make confused
4
: to produce fog on (something, such as a photographic film) during development
1
: to become covered or thick with fog
2
a
: to become blurred by a covering of fog or mist
b
: to become indistinct through exposure to light or radiation
Examples of fog in a Sentence
Noun
Heavy fog made it difficult to see the road.
a climate marked by heavy fogs
The fog reduced visibility to a quarter of a mile.
This problem has me in a fog.
Verb
The steam from the pot was fogging the window near the stove.
The bathroom was all fogged up after my shower.
politicians who try to fog the issue instead of taking a stand
Recent Examples on the Web
Ca Weather Bot, Sacbee.com, 28 Oct. 2025
Some of the fog could be dense, with visibility falling to one-quarter mile or less.
—Anna Skinner, MSNBC Newsweek, 27 Oct. 2025
Jenny Catlin, New York Times, 2 Oct. 2025
Rotisserie birds fogging their plastic takeout containers can’t be good for you.
—Matthew Shen Goodman, Harpers Magazine, 19 Sep. 2025
See All Example Sentences for fog
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Noun
In extremely dense fog where visibility is near zero, the best course of action is to first turn on your hazard lights, then simply pull into a safe location such as a parking lot of a local business, and stop.
—Ca Weather Bot, Sacbee.com, 28 Oct. 2025
Some of the fog could be dense, with visibility falling to one-quarter mile or less.
—Anna Skinner, MSNBC Newsweek, 27 Oct. 2025
Verb
Walls close enough to fog a visor.
—Jenny Catlin, New York Times, 2 Oct. 2025
Rotisserie birds fogging their plastic takeout containers can’t be good for you.
—Matthew Shen Goodman, Harpers Magazine, 19 Sep. 2025
See All Example Sentences for fog
Cite this Entry
“Fog.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fog. Accessed 3 Nov. 2025.
Copy CitationKids Definition
fog
1 of 2 noun
ˈfȯg 
ˈfäg
1
a
: fine particles of water floating in the atmosphere near the ground
b
: a fine spray or a foam for firefighting
2
: a gloomy condition of the atmosphere or a substance causing it
3
: a state of mental confusion
spent the morning in a fog
fog
2 of 2 verb
fogged; fogging
1
: to cover or become covered with or as if with fog
2
: to make confused
Medical Definition
fog
transitive verb
fogged; fogging
: to blur (a visual field) with lenses that prevent a sharp focus in order to relax accommodation before testing vision
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