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
John Towfighi, CNN, 5 Mar. 2025
Central Sacramento Valley, Southern Sacramento Valley, Carquinez Strait and Delta and Northern San Joaquin Valley are under a dense fog advisory which was issued by the National Weather Service on Tuesday at 4:55 a.m.
—Bay Area Weather Report, The Mercury News, 25 Feb. 2025
Clem Chambers, Forbes, 23 Jan. 2025
Her eyes well with tears that fog her black-rimmed glasses.
—Danielle Bacher, People.com, 3 Jan. 2025
See All Example Sentences for fog
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Noun
Kevin Gordon, a senior investment strategist at Charles Schwab, said the back and forth with tariffs has created a fog of uncertainty for investors, businesses and consumers.
—John Towfighi, CNN, 5 Mar. 2025
Central Sacramento Valley, Southern Sacramento Valley, Carquinez Strait and Delta and Northern San Joaquin Valley are under a dense fog advisory which was issued by the National Weather Service on Tuesday at 4:55 a.m.
—Bay Area Weather Report, The Mercury News, 25 Feb. 2025
Verb
Technical analysis is never fate but the above chart set up was enough to make my spectacles fog up, so what comes next is going to be very interesting indeed and further rises will be very bullish indeed.
—Clem Chambers, Forbes, 23 Jan. 2025
Her eyes well with tears that fog her black-rimmed glasses.
—Danielle Bacher, People.com, 3 Jan. 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 13 Mar. 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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