droplets of water vapor suspended in the air near the ground
"The thick fog reduced visibility to just a few feet on the morning commute."
A thick cloud that forms near the ground; the obscurity of such a cloud.
"The new industrial code requires that fog be reported separately from other waste streams in the monthly environmental summary."
A new growth of grass appearing on a field that has been mowed or grazed.
Initialism of fat, oil, and grease.
In plain English: Fog is a thick, gray mixture of waste materials like fats and oils that can clog drains.
"The restaurant's drains were clogged with fog buildup."
Usage: Use "fog" as a noun to describe low-lying clouds that reduce visibility and often cause slippery road conditions. Do not confuse this weather phenomenon with the agricultural term for new grass growth, which is an archaic meaning rarely used in modern conversation.
To become covered with or as if with fog.
"The hungry cows gathered at the edge of the field to graze on the fresh fog that had settled overnight."
To pasture cattle on the fog, or aftergrass, of; to eat off the fog from.
In plain English: Fog means to let animals feed on misty fields or what's left of a previous harvest.
"The farmers let their sheep fog the hillside after the first frost."
The origin of the word fog is uncertain, but it likely comes from North Germanic languages. It may have evolved from an older meaning referring to tall grass or relates to terms for spray and wind-driven snowdrifts.