Rewatching Band of Brothers, there's this scene where a CO says "Channel is socked in. No jump tonight!". Having seen BoB so many times, never bothered to look up "socked in". In context, knowing the situation, Operation Overlord, you just easily guessed D-Day was postponed because weather. But this time, I actually looked up "socked in".
SOCKED IN: Closed in by bad weather, often said of an airport; fogbound; snowbound. This expression originally found in the context of flying, has its roots in the use of a windsock at airports to provide wind direction. The windsock, a large, open-ended, cone-shaped sleeve attached to a post by a pivot, at one time provided pilots with wind direction. When the weather deteriorated (fog or snow) to the point that the sock couldn’t be seen, the field was said to be ‘socked in’ and takeoffs and landings would be difficult to impossible. The expression is said to date from the 1940s.
Now maybe if I were an amateur pilot or airplane enthusiast, would have known this, but I'm usually pretty diligent in looking up things I don't know, especially now with smartphones, have a good dictionary on the home screen, but language is a big thing, slang/idioms constantly changing and expanding. Makes me wonder all the slang I don't know, even though born and raised in the US and watch a lot of tv and movies. Thank the gods for Urban Dictionary, I say.