fog

UK: fɒɡ | US: fɑːɡ

Definition
  1. n. a thick cloud of tiny water droplets suspended in the atmosphere, reducing visibility

  2. vt. to cover or obscure with fog; to confuse or make unclear

Structure

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Etymology

The word "fog" originates from Old Norse fok ("spray, snowdrift") or Danish fog ("spray, driving snow"), likely influenced by Middle English fogge ("long grass, moss"). Over time, its meaning shifted from "dense moisture in the air" (e.g., sea spray or mist) to its modern sense of low-lying obscuring clouds. The semantic connection lies in the shared idea of "thick, dispersed particles impairing clarity."

Examples
  1. The morning fog blanketed the harbor, delaying the ships.

  2. Heavy fog reduced visibility to less than 50 meters on the highway.

  3. Her glasses fogged up when she stepped into the warm room.

  4. The politician’s vague answers only fogged the issue further.

  5. Scientists study how urban pollution exacerbates winter fog formation.