\ 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 fogless (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 But that day, over the coming hours, the twisting rock path stretched out before us into the distant fog. New York Times, "MIA couto," 8 July 2020 For their part, schools, faculty, and administrators are making decisions about reopening amid a fog of unknowns. Pia Ceres, Wired, "Colleges Gear Up for an Uncertain Fall Semester Online," 6 July 2020 To adapt a famous aphorism, your freedom to spray forth a fog of disease particles ends at the tip of my nose. Ryan Cooper, TheWeek, "Massachusetts is an exception to America's coronavirus failure," 2 July 2020 But watching her girls grow up from 140 miles away through the freeze-frame fog of FaceTime was almost worse than not seeing them at all. USA Today, "Through the mail, a visit from Grandma," 2 July 2020 Martha bikes through the fog to school, wearing a yellow rain jacket similar to Jonas’. Ashley Chervinski,, "R29 Binge Club: Netflix’s Dark Final Season Recap," 28 June 2020 And of course, there are the conspiracies hinting at nefarious motives -- unproven allegations in the fog of a late-night M-80. Scottie Andrew, CNN, "It's not just you -- there's a sudden wave of fireworks exploding in cities across the US," 23 June 2020 The Vietnam War was conducted through a fog of lies. Fintan O’toole, The New York Review of Books, "The Unpresident and the Unredeemed Promise," 12 June 2020 No clouds or fog, just atmospheric dust creating the haze. Judson Jones, CNN, "Saharan dust arrives in the US," 26 June 2020 Recent Examples on the Web: Verb Cleaners fog disinfectants over rooms and wipe down tables and chairs. Washington Post, "Thermometers in hand, Dubai opens for tourists amid pandemic," 7 July 2020 These face masks are completely clear while covering the nose and mouth and do not fog up, according to ClearMask COO and co-founder Elyse Heob. Audrey Jensen, The Arizona Republic, "For some Arizonans with hearing loss, the pandemic poses unique challenges," 5 July 2020 Housekeeping has gone next-level, with Marriott introducing sanitizing sprayers to fog rooms after checkout, and some hotels offering door hangers with amenity refills, cutting down on how often hotel staff will need to enter your room, if at all. Cnt Editors, Condé Nast Traveler, "How Travel Will Change," 29 May 2020 Trucks fogged city streets with DDT, and local Boy Scout troops would spray the high-powered insecticide into trash cans. Dawn Mitchell, Indianapolis Star, "When polio fears forced the closure of Hoosier pools," 29 May 2020 Besides getting rid of any lingering germs, this could help stop your glasses from fogging up when wearing a mask, as the soap leaves behind a thin film that prevents mist from gathering on the lenses. 3. Jessica Bennett, Better Homes & Gardens, "4 Essential Face Mask Hacks You Need to Know if You Wear Glasses," 15 May 2020 And Lissmann also began to cry, fogging up her mask. Bill Glauber, Milwaukee Journal Sentinel, "'She gave me hope': Nurse helped Judge Derek Mosley through a harrowing night in ICU on his way to surviving coronavirus," 8 May 2020 And sometimes a mask fogs up my glasses, which is annoying. Dallas News, "The Maskification of America happened quickly, but not for everybody," 7 May 2020 Over the course of Bloom’s 12 hours, the elastic cuts into her ears and her breath makes her face hot, fogging up her glasses. Communicating with patients is difficult. Bryce Covert, The Atlantic, "The Overworked, Underpaid Workers Fighting the Pandemic," 14 Apr. 2020

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

11 Jul 2020

Cite this Entry

“Fog.” Dictionary, Merriam-Webster, Accessed 12 Jul. 2020.

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More Definitions for fog


How to pronounce fog (audio)

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.
\ 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

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More from Merriam-Webster on fog

Thesaurus: All synonyms and antonyms for fog

Rhyming Dictionary: Words that rhyme with fog

Spanish Central: Translation of fog

Nglish: Translation of fog for Spanish Speakers

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

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