The antonyms for the phrase "loses heart to" include words such as regain, rekindle, revive, reignite, invigorate, renew, and restore. When someone loses heart to a particular thing, it means they have lost interest, enthusiasm, or hope in it. Therefore, the antonyms for this phrase suggest a sense of rejuvenation, revitalization, and motivation towards the same thing. For instance, if someone has lost heart to working out, they can regain their interest by trying new routines or finding a workout buddy. Similarly, if someone loses heart to a relationship, they can reignite the romance by spending quality time together or trying new activities.