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
David Hochman, Forbes.com, 18 May 2025
Zero visibility strategy: In cases of near-zero visibility due to dense fog, activate your hazard lights and seek a safe spot, like a nearby business parking lot, to pull over and stop.
—Nc Weather Bot, Charlotte Observer, 15 May 2025
Lauren Wingenroth, SELF, 1 May 2025
Known for its calming, anti-anxiety effects, lavender gives the Victorian London fog a medicinal boost, while the blueberry green tea provides energy and antioxidants.
—Anna Haines, Forbes, 12 Dec. 2024
See All Example Sentences for fog
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Noun
The views of rooftops, treetops, and (if the fog cooperates) the Bay are nothing short of cinematic.
—David Hochman, Forbes.com, 18 May 2025
Zero visibility strategy: In cases of near-zero visibility due to dense fog, activate your hazard lights and seek a safe spot, like a nearby business parking lot, to pull over and stop.
—Nc Weather Bot, Charlotte Observer, 15 May 2025
Verb
There are lots of benefits to the Astral Sphere’s more anatomical shape—the extra room between your eye and the lens can reduce the risk of fogging, as well as increase clarity and comfort.
—Lauren Wingenroth, SELF, 1 May 2025
Known for its calming, anti-anxiety effects, lavender gives the Victorian London fog a medicinal boost, while the blueberry green tea provides energy and antioxidants.
—Anna Haines, Forbes, 12 Dec. 2024
See All Example Sentences for fog
Cite this Entry
“Fog.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fog. Accessed 29 May. 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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