\ ˈfȯg How to pronounce fog (audio) , fäg \

Definition of fog

 (Entry 1 of 2)

1a : 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
3a : 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

Definition of fog (Entry 2 of 2)

transitive verb

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

intransitive verb

1 : to become covered or thick with fog
2a : to become blurred by a covering of fog or mist
b : to become indistinct through exposure to light or radiation

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Other Words from fog


fogless \ ˈfȯg-​ləs How to pronounce fog (audio) , ˈfäg-​ \ adjective

Synonyms & Antonyms for fog

Synonyms: Noun

Synonyms: Verb

Antonyms: Verb

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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
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Recent Examples on the Web: Noun Still, policymakers and economists must see through the fog of this recovery, despite rocky indicators that are changing in real time., 29 July 2021 Leaders have to lead their teams in a whole new way to bridge the gap of uncertainty, to move through the fog of obscurity and to venture into new grounds to create value for their stakeholders. Jedidiah Alex Koh, Forbes, 25 June 2021 But as the sun broke through the fog and the conditions got tougher, Rodgers struggled toward the end of the first round at Torrey Pines in La Jolla, Calif. Scott Horner, The Indianapolis Star, 18 June 2021 Wright tracks back through the fog to Wuhan, China, sifting through the zoologic leap (or leaps) from bats to humans. Dallas News, 10 June 2021 Wright tracks back through the fog to Wuhan, China, sifting through the zoologic leap (or leaps) from bats to humans. Hamilton Cain Special To The Star Tribune, Star Tribune, 4 June 2021 The simple integrity of a word cuts through the fog of her self-delusion too painfully. Sophie Gilbert, The Atlantic, 20 May 2021 One way through the fog is to split greenhouse-gas emissions from the wider pack. Rochelle Toplensky, WSJ, 18 May 2021 But Volpe’s purple beats are far more affecting on their own, collected in a psychedelic little package where dreamy melodies pierce through thick fog. Vulture Editors, Vulture, 20 Apr. 2021 Recent Examples on the Web: Verb Comfortable and breathable and doesn't fog up glasses. Eden Lichterman,, 26 Aug. 2021 The department planned to fog mosquitoes in the Churchill Downs, Iroquois, Old Louisville and Irish Hills areas Wednesday evening. Sarah Ladd, The Courier-Journal, 20 Aug. 2021 Don’t let vague half-truths cloud your judgment or fog your thinking during the week ahead. Tribune Content Agency, oregonlive, 4 July 2021 The inner part of the goggles and lenses won’t fog up, thanks to the latest Environmental Treatment Technology. Chris Hachey, BGR, 18 May 2021 The impact-resistant PC lenses protect children from UV rays and are designed to not fog up. Chris Hachey, BGR, 18 May 2021 Your specs fog up because the mask directs your breath upward instead of in front of you, which is good for preventing disease transmission but bad for anyone with less-than-stellar eyesight. Scottie Andrew, CNN, 21 Apr. 2021 That’s what happens when your mask doesn’t fit correctly and your eyeglasses fog up. Washington Post, 18 Apr. 2021 Showers Saturday will give way to mist, drizzle and fog in the evening as temperatures dip into the mid-40s, the weather service said. Charles J. Johnson,, 10 Apr. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'fog.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of fog


1544, in the meaning defined at sense 1a


circa 1592, in the meaning defined at transitive sense 1

History and Etymology for fog


probably back-formation from foggy

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Statistics for fog

Last Updated

10 Sep 2021

Cite this Entry

“Fog.” Dictionary, Merriam-Webster, Accessed 20 Sep. 2021.

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More Definitions for fog



English Language Learners Definition of fog

 (Entry 1 of 2)

: many small drops of water floating in the air above the ground, the sea, etc.
: a state of mental confusion



English Language Learners Definition of fog (Entry 2 of 2)

: to cover or fill (something) with small drops of water : to make (something) foggy
: to become foggy
: to make (someone or something) confused


\ ˈfȯg How to pronounce fog (audio) , ˈfäg \

Kids Definition of fog

 (Entry 1 of 2)

1 : tiny drops of water floating in the air at or near the ground
2 : a confused state of mind I woke up in a fog.


fogged; fogging

Kids Definition of fog (Entry 2 of 2)

: to cover or become covered with tiny drops of water Steam from the shower fogged the mirror.


transitive verb
\ ˈfäg, ˈfȯg How to pronounce fog (audio) \
fogged; fogging

Medical Definition of fog

: to blur (a visual field) with lenses that prevent a sharp focus in order to relax accommodation before testing vision

More from Merriam-Webster on fog

Nglish: Translation of fog for Spanish Speakers

Britannica English: Translation of fog for Arabic Speakers Encyclopedia article about fog


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