The phrase "live-and-die" implies a strong attachment or commitment to someone or something, often to the point of being willing to sacrifice everything for it. Synonyms for "live-and-die" might include "stand by," "remain loyal," or "stick with." Other possible options might be "persevere," "endure," or "persist," which suggest maintaining a commitment despite challenges or difficulties. "Devotion" or "dedication" could also be considered synonyms, as both imply a strong level of commitment. Regardless of the exact synonym chosen, the phrase "live-and-die" indicates a deep connection and sense of loyalty, implying a willingness to fight or even die for a cause or person.