The phrase "breathed one last" refers to the final exhale and passing of someone's life. Its antonyms would be words or phrases that describe continued life, such as "breathed a new beginning," "took their first breath," or "breathed new life." Other antonyms could include "revived," "reanimated," "resurrected," or "rejuvenated." These words would suggest a new lease on life as opposed to the end of it. It's important to remember that death is a natural part of life, and while it may be difficult to think about, the end of one life often means the beginning of another.