It's very possible I don't understand, but I'm sure I do, as when I tried to get myself to define it, it was just about word-per-word of what others had said it was.
I understand it's unintentional, and sure revenge has to be intentional, but I didn't really mean revenge, at least not literally, but it is very similar to revenge or an eye for an eye. It's just unconscious revenge?
If I punch a tree branch, and the branch flies back and hits me in the face, even though it isn't a conscious move, therefore not revenge, it is still very similar to revenge, the only thing missing is that it wasn't intentional.
That's how I was understanding Karma^ If I'm wrong, please say.