The phrase "live off" means to make a living or survive by using or relying on a particular thing or person. Some synonyms for "live off" include "depend on," "subsist on," "rely upon," "survive on," "thrive on," and "exist on." These words emphasize the idea of relying on something or someone to sustain oneself. For example, someone might say, "I live off my savings" or "I live off my parents' financial support." Ultimately, the choice of synonym depends on the context and intended meaning. Regardless of the word used, the message remains that someone is depending on something external to sustain themselves.