fog
B1General (Neutral). Can be used in formal, informal, literary, and technical contexts.
Definition
Meaning
A thick cloud of tiny water droplets suspended in the atmosphere at or near the earth's surface, causing reduced visibility.
A state of mental confusion or obscurity; anything that darkens or obscures clarity, understanding, or perception; in photography, a darkened area on a negative or print caused by stray light or chemical reaction.
Linguistics
Semantic Notes
As a noun, primarily refers to weather; metaphorical uses are common. As a verb (to fog), means to cover or become covered with condensation, or to make something obscure.
Dialectal Variation
British vs American Usage
Differences
No significant difference in primary meaning. Both use 'fog' and 'mist', though 'fog' implies denser, more visibility-reducing conditions. UK usage may more readily apply 'fog' metaphorically to describe mental states or confusion ('a fog of doubt').
Connotations
Similar connotations of obscurity, danger (on roads), and mystery. The idiom 'in a fog' (confused) is used equally.
Frequency
Similar high frequency in both varieties due to the common weather phenomenon.
Vocabulary
Collocations
Grammar
Valency Patterns
[N] The fog was dense.[V] The windows fog up.[V N] Steam fogged his glasses.[BE fogged with N] His mind was fogged with medication.[ADJ + N] He gave a fog-bound city a wide berth.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “in a fog (confused)”
- “fog up (to become covered with condensation)”
- “lift the fog (clarify something)”
- “a fog of war (uncertainty during conflict)”
Usage
Context Usage
Business
'Fog' is rarely used literally; can appear metaphorically: 'The new regulations created a fog of uncertainty for investors.'
Academic
Used both literally in geography/environmental science and metaphorically in humanities (e.g., 'a historical fog', 'cognitive fog').
Everyday
Primarily for weather: 'Drive carefully, there's fog on the motorway.' Or for confusion: 'Sorry, I'm in a complete fog this morning.'
Technical
In meteorology: 'Radiation fog forms under clear, calm conditions.' In photography: 'The developer caused fog on the film.'
Examples
By Part of Speech
verb
British English
- The bathroom mirror always fogs up when I have a shower.
- His spectacles were completely fogged by the steam from the kettle.
American English
- The windshield is fogging over; turn on the defroster.
- The controversy has only fogged the issue further.
adverb
British English
- Not commonly used. 'Foggily' is rare and literary: 'He stared foggily at the page.'
American English
- As above, 'foggily' is rare and stylistic.
adjective
British English
- We had to cancel the cricket match due to foggy conditions.
- He woke up with a foggy head after the late night.
American English
- It's too foggy to drive safely on the highway.
- Her memory of the event was just a foggy blur.
Examples
By CEFR Level
- Look outside, it's very foggy today!
- I can't see the mountains because of the fog.
- The car windows are all fogged up.
- Driving in thick fog requires extra caution.
- The morning fog had lifted by ten o'clock.
- Sorry, I'm a bit foggy-headed before my coffee.
- A dense fog of misinformation surrounded the political scandal.
- The pilot couldn't land due to the freezing fog blanketing the runway.
- Her explanation only served to fog the issue even more.
- The report aimed to dispel the fog of conjecture surrounding the economic forecast.
- His memories of the trauma were mercifully fogged by time.
- The novelist excels at depicting characters enveloped in a psychological fog.
Learning
Memory Aids
Mnemonic
Think of a FOGgy day – you can't see the dOG. Both 'fog' and 'dog' are short, common words.
Conceptual Metaphor
UNCERTAINTY/OBSCURITY IS FOG ('clearing the fog of misunderstanding', 'lost in a fog of data').
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Russian 'туман' covers both 'fog' and 'mist'. English 'fog' is denser than 'mist' (visibility <1 km).
- Russian 'дымка' is better translated as 'haze'.
- Avoid translating 'in a fog' literally; use the idiom 'в тумане' or 'в замешательстве'.
Common Mistakes
- Using 'fog' for 'smoke' (unless it's 'smog').
- Confusing 'foggy' (adj) with 'vague' or 'unclear' in inappropriate contexts.
- Incorrect verb tense: 'The mirror is fogging' not 'The mirror fogs' (for current, ongoing state).
Practice
Quiz
Which of the following is NOT a typical metaphorical use of 'fog'?
FAQ
Frequently Asked Questions
Meteorologically, 'fog' is denser, reducing visibility to less than 1 km. 'Mist' is lighter, with visibility over 1 km. In everyday language, 'fog' is used for the thicker, more disruptive condition.
Yes. It commonly means to cover or become covered with condensation ('The glass fogged up') and, less commonly, to make something obscure or confused ('His rhetoric fogged the real issue').
It is negative, describing a state of mental confusion, bewilderment, or lack of clarity (e.g., 'I was in a fog after the long flight').
It refers to an unwanted darkening or veil on a film negative or print, caused by exposure to stray light, outdated film, or improper chemical processing.
Collections
Part of a collection
Weather
A2 · 45 words · Describing the weather, climate and seasons.