- 1a thick cloud of very small drops of water in the air close to the land or ocean, 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). Topic 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 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/blankets 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 rain pours (down) 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 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
- 2a state of confusion, in which things are not clear He went through the day with his mind in a fog.
NAmE//fɔɡ//, NAmE//fɑɡ//[uncountable, countable]