Normally, People have good reasons to hold a grudge, although sometimes they are irreasonable.
Irreasonable Grudge: I hold a grudge on her because she didn't call me back that one time.
2. You hold on to the problem because you have nothing better to do in life.
3. Something someone does in order to make peoples' lives harder.
(person two) yah ... lets go grudge her *sweeps hair over face*