fog

1 of 2

noun

ˈfȯg 

fäg

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

fogless

ˈfȯg-ləs 

ˈfäg-

adjective

fog

2 of 2

verb

fogged; fogging

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

2

a

: to become blurred by a covering of fog or mist

b

: to become indistinct through exposure to light or radiation

Synonyms

Noun

• daze
• dazedness
• haze
• muddle
• spin
• swoon

Verb

• becloud
• befog
• blur
• cloud
• confuse
• muddy
• obfuscate

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

Noun

Neptune direct removes the fog from your sixth house of health habits and work dynamics. —Valerie Mesa, People.com, 6 Dec. 2024

As the sun and Mercury align, the fog in your mind parts. —USA TODAY, 5 Dec. 2024

Verb

Depending on the patient, the condition can rob someone of energy, scramble the autonomic nervous system, or fog their memory, among many other symptoms. —Sarah Boden, NPR, 25 Nov. 2024

Amazing wave clouds form over Catoctin Mountains of Maryland PM Update: Late-night patchy fog slightly possible. —Washington Post, 3 Mar. 2024

Word History

Etymology

Noun

probably back-formation from foggy

First Known Use

Noun

1544, in the meaning defined at sense 1a

Verb

circa 1592, in the meaning defined at transitive sense 1

Phrases Containing fog

• brain fog
• fog lamp
• fog light
• ice fog

Kids 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

ˈfäg, ˈfȯg 

fogged; fogging

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