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fog

SayFOG/fɑɡ/UK/fɒɡ/

Pluralfogs (some meanings)

Verbfogs, fogging, fogged

16 meanings of fog

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  1. 1
    low cloudnoununcountable
    A thick cloud near the ground that makes it hard to see.

    The fog was so thick that we could not see the road.

    We waited for the fog to lift before we went sailing.

    UsageSay thick fog. When fog goes away, it lifts or clears.

    Similarmist, haze

  2. 2
    nounfigurativelycountable or uncountable
    A tired, confused feeling when you cannot think clearly.

    I was in a fog all morning after staying up so late.

    The fog in his head cleared after a good night's sleep.

    UsageOften in a fog: she spent the day in a fog.

    Similarhaze, daze

  3. 3
    verbintransitive
    To become, or make something, cloudy with tiny drops of water, like glasses or a mirror.

    Car windows often fog on cold mornings.

    Her swim goggles fogged halfway across the pool.

    UsageOften fog up: my glasses fog up.

    Similarmist, steam, cloud

    Oppositeclear

  4. 4
    steam (on glass)noununcountable
    A cloudy layer, like steam, that covers a surface such as glass.

    He wiped the fog off his glasses.

    There was fog on the kitchen window after we cooked dinner.

    Similarmist, film, steam, condensation

  5. 5
    verbtransitive
    To make something hard to understand or think about clearly.

    Being very tired can fog your thinking.

    All the extra details fogged the main point of her story.

    Similarcloud, obscure, blur

    Oppositeclarify

  6. 6
    verbtransitive
    To cover something with fog or a fine spray, such as a spray that kills insects.

    The city will fog the park to kill mosquitoes.

    A machine fogged the dance floor with white smoke.

    Similarspray, mist

    Note

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Origin

The origin is not certain, but it probably comes from a Scandinavian language. It may come from foggy, an old word meaning covered with tall grass or marshy, or be related to Danish fog, meaning “spray” or “drift”.

Checked 31 Oct 2026 · 5 facts