FOG

[noun] - a weather condition in which very small drops of water gather together to form a thick cloud close to the land or sea, making it difficult to seeThick/Heavy/Swirling fog has made driving conditions dangerous. [U]Mists, freezing fogs and snow are common in this area. [C]Fog came rolling in from the ocean. [U]It took several hours for the fog to lift. [U](figurative informal) I felt in a fog (= confused) about what to do next. [U]Fog can also be used to mean something which makes it impossible to understand or think about something else clearly.We became completely lost in the fog of conditions surrounding our application for a loan.The origins of Valentine cards are wrapped in a fog of history.A fog bank is a thick cloud of fog, esp. at sea.A fog light or fog lamp is a special light at the front or back of a vehicle that helps you to see and be seen when driving through fog.