Antonyms for the phrase "break a heart" include "mend a heart," "heal a heart," "comfort a heart," and "ease a heart." These antonyms signify actions or behaviors aimed at repairing emotional damage caused by a personal relationship or experience. When someone is hurt, offering support, care, or love can help to undo the harm, restore trust, and rebuild the bond. By doing so, the affected party may feel stronger, happier, or more complete such that the pain of the past is erased. Overall, cultivating empathy, forgiveness, and kindness can help prevent situations where someone's heart is broken in the first place.