The phrase "calling it quits" is used to describe a decision to stop doing something or end a relationship. However, there are several antonyms or opposite words that can be used instead. One of them is "persevering," which means to continue with something despite difficulties. Another antonym is "persisting," which refers to a person's determination to carry on with a course of action. Alternatively, one may choose to describe the situation using the word "rekindling," which means reigniting or renewing something that had been lost or forgotten. Another possible antonym is "beginning anew," which refers to the act of starting afresh without any baggage from the previous endeavor.