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
Joshua Kurp, Vulture, 4 Nov. 2024
Unlike the multi-sensor setups of Waymo and Cruise, Tesla’s reliance on cameras alone presents challenges, particularly in low-visibility conditions like fog, snow, or harsh sunlight.
—Michael Khouw, CNBC, 4 Nov. 2024
Hallie Milstein, Southern Living, 26 Oct. 2024
Here is Louisville's forecast for the rest of the week:
Wednesday evening
Patchy fog before 3 a.m., then patchy fog after 4 a.m.
—Ana Rocío Álvarez Bríñez, The Courier-Journal, 16 Oct. 2024
See all Example Sentences for fog 
Examples are automatically compiled from online sources to
show current usage.
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Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
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Noun
Plot: Marge accidentally kills Flanders during one of his fog walks.
—Joshua Kurp, Vulture, 4 Nov. 2024
Unlike the multi-sensor setups of Waymo and Cruise, Tesla’s reliance on cameras alone presents challenges, particularly in low-visibility conditions like fog, snow, or harsh sunlight.
—Michael Khouw, CNBC, 4 Nov. 2024
Verb
De-Fog Mirrors Before getting in the shower and using shampoo on your hair, use shampoo to prevent your bathroom mirror from fogging up from the shower’s humidity.
—Hallie Milstein, Southern Living, 26 Oct. 2024
Here is Louisville's forecast for the rest of the week:
Wednesday evening
Patchy fog before 3 a.m., then patchy fog after 4 a.m.
—Ana Rocío Álvarez Bríñez, The Courier-Journal, 16 Oct. 2024
See all Example Sentences for fog
Dictionary Entries Near fog
Cite this Entry
“Fog.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fog. Accessed 22 Nov. 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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