Resentment is a negative reaction to expressions of bad will. Gratitude is a positive reaction to expressions of good will. To give up resentment, when someone has wronged you, is to forgive them. We might expect an analog for giving up gratitude. The practice features in some ordinary and extraordinary moments in our lives. But it is unnamed and unstudied. I clarify what giving up gratitude is. I identify three types of ordinary and important cases. I then attend to implications; (...) in particular, my account sheds light on restorations of gratitude analogous to un-forgiving. Restoring gratitude may help to repair relationships, and restoring your once-lost gratitude may be morally required in some contexts. More generally, by taking account of gratitude as a dynamic attitude that may be given up and restored as fits the situation and one’s judgment, we may better understand the power and flexibility of gratitude’s everyday function. (shrink)