What does "for a living" mean?
When someone says that they do [something] for a living, they mean that it is their job or professional role. The boy in this video has used "for a living" to express that in the future, he wants to be a professional gamer. Ex: My dream is to sing for a living. But I know it'll be a tough road. Ex: A: What do you do for a living? B: I'm a teacher.
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