- For Teachers
Hello, I didn't get the whole meaning of this expression; its just like an emphasising idiom?
Yes, this is an idiom.
Better to give more context, but you are correct. It means that someone stands up quickly, and is generally used to emphasise surprise or eagerness. No "jumping" need actually be involved....
I'm not a teacher of English, but I have spoken it for (almost) all of my life....