noun

1. a large mass of water vapor condensed to fine particles, at or just above the earth's surface; thick, obscuring mist
2. a similar mass of smoke, dust, etc. obscuring the atmosphere
3. a vaporized liquid, as insecticide, dispersed over a large area
4. a state of mental dimness and confusion; blurred, bewildered state
5. a grayish area on a photograph or film

Etymology: prob. < Scand, as in ON fok, Dan (sne)fog, driving snow, Norw dial. fuka, sea mist < IE base *pū-, to puff up, blow, of echoic orig.

intransitive verb fogged, fogging fog′·ging

1. to become surrounded or covered by fog
2. to be or become blurred, dimmed, or obscured

transitive verb

1. to surround or cover with fog
2. to blur; dim; obscure
3. to confuse; bewilder
4. Slang to hurl (a baseball, etc.)
5. to make (a photograph, etc.) grayish in certain areas