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
Anita Nelson, Forbes.com, 24 June 2025
An international team of astronomers now suggests this signal could be used to determine how light from the first stars interacted with this cosmic fog, helping to lift it.
—Robert Lea, Space.com, 24 June 2025
Mackenzie Cummings-Grady, Billboard, 10 June 2025
In a minor way, pre-race, that popularity also fogged in the money on the day of the race at the track, which, as predicted here, wavered slightly as the afternoon wore on but ultimately ticked over to establish Journalism as the fractional favorite at post time.
—Guy Martin, Forbes.com, 8 June 2025
See All Example Sentences for fog
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Noun
Navigating a business through economic uncertainty can feel like driving at night on an unfamiliar road as the fog rolls in.
—Anita Nelson, Forbes.com, 24 June 2025
An international team of astronomers now suggests this signal could be used to determine how light from the first stars interacted with this cosmic fog, helping to lift it.
—Robert Lea, Space.com, 24 June 2025
Verb
His glasses were fogged up, tilted at an angle across the pointed frame of his nose.
—Mackenzie Cummings-Grady, Billboard, 10 June 2025
In a minor way, pre-race, that popularity also fogged in the money on the day of the race at the track, which, as predicted here, wavered slightly as the afternoon wore on but ultimately ticked over to establish Journalism as the fractional favorite at post time.
—Guy Martin, Forbes.com, 8 June 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 Jul. 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
Love words? Need even more definitions?
Merriam-Webster unabridged
Share