Went under is used to mean they have failed, as in drowning. A business that went under is one that has closed or gone bankrupt.
It's not an idiom because you can figure it out by the context. It means they went bald.
It means secretly.
Nothing that I have ever heard. "Under the weather" is an idiom, but there's no anger in the phrase.
Er ... what? Are you asking what "under one's wing" means? Here's a link.
It depends on what the rest of the phrase said. "Everything under the sun" is a figurative way of saying "everything," while "under the sun" alone would mean out in the sunlight.
The idiom, "You must have been under a rock" means that you must have been away, in hiding or had no contact with civilization to miss this big eventFor example 'You didn't hear about him? You must have been living under a rock to miss that!'
Having already been judged badly, and having to get out from under the cloud before proceeding.to be under suspicion or in disgrace; to be in disfavor.
You can't show me anything that I haven't seen already.?
It's not really an idiom. It means "what are you thinking about."
It is not an idiom, it means your nose is itching.
RFP is not an idiom. It's an abbreviation.
The idiom down to the wire means to the very last possible moment. Therefore, the entire phrase would stand to mean that "it went to the very last split second and we almost missed your flight, but made it."