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
Samantha Subin, CNBC, 18 July 2025
Be sure to pay homage to John Steinbeck at Cannery Row in Monterey, then bundle up to cut through the fog in San Francisco.
—Jessie Beck, AFAR Media, 17 July 2025
Miami Herald, 14 July 2025
These fogging operations take place at dusk, when mosquitoes are most active and looking for food, officials said.
—Molly Morrow, Chicago Tribune, 28 June 2025
See All Example Sentences for fog
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Noun
Lifting the London fog A Burberry store at Fashion Valley, an upscale shopping mall, on Dec. 13, 2024, in San Diego, California.
—Samantha Subin, CNBC, 18 July 2025
Be sure to pay homage to John Steinbeck at Cannery Row in Monterey, then bundle up to cut through the fog in San Francisco.
—Jessie Beck, AFAR Media, 17 July 2025
Verb
Using a strategy called canopy knockdown, the team fogged the canopy at the Tiputini Biodiversity Station with an insecticide, causing specimens to drop to the ground for collection.
—Miami Herald, 14 July 2025
These fogging operations take place at dusk, when mosquitoes are most active and looking for food, officials said.
—Molly Morrow, Chicago Tribune, 28 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 23 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
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