The words that come to mind as antonyms for "break it off" are to reconcile or mend. When a relationship is on the rocks, it might be time to have a heart-to-heart conversation and work through the issues at hand. Communication is key in any relationship, and by getting to the root of the problem, couples can find a way to patch things up and move forward. Breaking it off means ending the relationship altogether, whereas mending and reconciling involve putting in effort to fix what is broken. Sometimes, taking a break can give both parties time to reflect and come back to the table with a fresh perspective.