I had a friend once in Europe who wished to speak American English the way Americans speak it, full of slang and idiom. Once, when I asked her how she was, she said that the weather was on top of her. I had to think about that for a moment, then stifle a laugh so that I didn’t embarrass her. She meant, of course, that she was under the weather.
At this instant, the weather is on top of me, as well.
When it rises, I’ll return to write some more.