Question: what does it mean when someone asks you what do you do for a living?
Answer: You can talk about a person's job as what they "do for a living". What do you do for a living? I think he told me what he does for a living, but I forgot what he said. "Do ___ for a living" is related to other phrases like "earn a living" and "make a living" which both mean to earn enough money to live normally.