Definition of fog noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//fɒɡ//
    ; NAmE NAmE//fɔːɡ//
    , NAmE//fɑːɡ//
    [uncountable, countable] Sky
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  1. 1a thick cloud of very small drops of water in the air close to the land or sea, that is very difficult to see through Dense/thick fog is affecting roads in the north and visibility is poor. freezing fog Patches of fog will clear by mid-morning. We get heavy fogs on this coast in winter. The town was covered in a thick blanket of fog. The fog finally lifted (= disappeared). CollocationsThe weatherGood weather be bathed in/​bask in/​be blessed with/​enjoy bright/​brilliant/​glorious sunshine the sun shines/​warms something/​beats down (on something) the sunshine breaks/​streams through something fluffy/​wispy clouds drift across the sky a gentle/​light/​stiff/​cool/​warm/​sea breeze blows in/​comes in off the sea the snow crunches beneath/​under somebody’s feet/​bootsBad weather thick/​dark/​storm clouds form/​gather/​roll in/​cover the sky/​block out the sun the sky darkens/​turns black a fine mist hangs in the air a dense/​heavy/​thick fog rolls in the rain falls/​comes down (in buckets/​sheets)/pours down snow falls/​comes down/​covers something the wind blows/​whistles/​howls/​picks up/​whips through something/​sweeps across something strong/​gale-force winds blow/​gust (up to 80 mph) a storm is approaching/​is moving inland/​hits/​strikes/​rages thunder rolls/​rumbles/​sounds (forked/​sheet) lightning strikes/​hits/​flashes a (blinding/​snow) blizzard hits/​strikes/​blows/​rages a tornado touches down/​hits/​strikes/​destroys something/​rips through something forecast/​expect/​predict rain/​snow/​a category-four hurricane (North American English) pour (down)/ (British English) pour (down) with rain get caught in/​seek shelter from/​escape the rain be covered/​shrouded in mist/​a blanket of fog be in for/​brave/​shelter from a/​the storm hear rolling/​distant thunder be battered/​buffeted by strong winds (British English) be blowing a gale battle against/​brave the elementsThe weather improves the sun breaks through the clouds the sky clears/​brightens (up)/lightens (up) the clouds part/​clear the rain stops/​lets up/​holds off the wind dies down the storm passes the mist/​fog lifts/​clears compare mist See related entries: Sky
  2. 2a state of confusion, in which things are not clear He went through the day with his mind in a fog.
  3. Word Originmid 16th cent.: perhaps a back-formation from foggy.Extra examples A dense fog came down in the afternoon. A freezing fog lay over the valley. A heavy fog rolled in from the coast. Drizzle and patchy fog are forecast. The fog had lifted by late morning. The town was shrouded in a thick blanket of fog. We drove slowly through the fog. We got lost in the fog. fog drifting over the water Dense fog is affecting roads in the north and visibility is poor. Freezing fog will make driving conditions very treacherous. Visibility good, becoming moderate with fog patches.
See the Oxford Advanced American Dictionary entry: fog

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