sock in something/somewhere

phrasal verb /sɑk/

. to stop all travel or movement of vehicles in an area because of fog:

. The entire coast was socked in all week.

Cambridge Dictionary

"Socked in" is the weather term of the day. In the early days of aviation, this term was used to describe weather at an airport when ceiling/visibility were of such low values that the airport was effectively closed to aircraft operations. The term probably originated from reference to the wind sock. When the "sock" was in the clouds or when the visibility was so badly impaired that the "sock" was not visible, the airport was "socked in." The expression still is widely used. (This definition was written in 1959. The term "socked in" is still commonplace in 2013.)

US National Weather Service Nashville Tennessee on Facebook

Not a locution I was familiar with. Online one finds places and areas described as:

socked in by smoke

socked in by snow

socked in by summer storm clouds

socked in by freezing fog

socked in by smog

socked in by clouds

socked in by the rain

socked in by fog and low clouds

Obviously here the sense is something like “enclosed by fog / mist” / “foggy.”

... Sock in bedeutet laut Bing (re OP) ... -- Hmmm ... ich kenne Bing als Suchmaschine, nicht als Wörterbuch ... woher hat die B. dann diese Definition ?