Yes, it is. It means mildly ill or not at one's best; gloomy.
Nothing that I have ever heard. "Under the weather" is an idiom, but there's no anger in the phrase.
Yes it is an idiom because the literal meaning doesn't make sense.
"Tom was feeling under the weather after catching a cold."
"The idiom 'that just kills' is hardly appropriate at a funeral."
If you are "under the weather," then you are feeling ill. The image is of a dark cloud hanging over you, making you miserable.The idiom "feeling a bit under the weather" means that a person is feeling slightly ill.
There is a nautical explanation that refers to be under the weather bow of a boat, a part of the boat that takes the force of rough seas. A cause of sea sickness
The opposite terms are down and within. The idiom "up and about" (recuperated) would have the opposites "under the weather" or bedridden, and any subsequent occurrence would be a "relapse."
under what headword would you find the idiom raining cats and dogs?
It means secretly.
break a mouth
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This means that the person has the situation under control.