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
Synonyms
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
IEEE Spectrum, 18 June 2024
The National Weather Service has issued a dense fog advisory for Wednesday morning.
—Drew Dawson, Journal Sentinel, 11 June 2024
Lauren Carpenter, USA TODAY, 21 June 2024
Listen to this article A grizzly bear who attacked a Massachusetts hiker in Wyoming’s Grand Teton National Park ran away after reportedly biting into the man’s bear spray canister and fogging itself.
—Brian Niemietz, New York Daily News, 23 May 2024
See all Example Sentences for fog 
Noun
Level 4 AVs were drastically better in rain and fog, which suggests that the presence of radar and lidar systems gives AVs an advantage in weather conditions that reduce visibility.
—IEEE Spectrum, 18 June 2024
The National Weather Service has issued a dense fog advisory for Wednesday morning.
—Drew Dawson, Journal Sentinel, 11 June 2024
Verb
According to Carol, prioritizing financial gains, quarterly margins, and sheer numbers to the exclusion of any other measurements may lead to losing sight of True North, fogging the company’s ultimate objective and hindering long-term progress.
—Lauren Carpenter, USA TODAY, 21 June 2024
Listen to this article A grizzly bear who attacked a Massachusetts hiker in Wyoming’s Grand Teton National Park ran away after reportedly biting into the man’s bear spray canister and fogging itself.
—Brian Niemietz, New York Daily News, 23 May 2024
See all Example Sentences for fog
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'fog.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Dictionary Entries Near fog
Cite this Entry
“Fog.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fog. Accessed 7 Jul. 2024.
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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