You could reuse the coffee grounds to make another pot of coffee but the coffee would not be as good and would be watered down and weak.
I once tried making a second pot of coffee with some used coffee grounds when I was getting low on coffee and although it was okay it was nowhere near as good as coffee made from new coffee grounds and I never tried it again.
So it won't hurt you or anything to make coffee from the used coffee grounds but don't expect it to taste as good as coffee made with fresh coffee grounds.