Of course your existence matters to other people—your parents and others who care about you—but taken as a whole, their lives have no point either, so it ultimately doesn't matter that you matter to them. You matter to them and they matter to you, and that may give your life a feeling of significance, but you're just taking in each other's washing, so to speak.
[What does it all mean, T. Nagel]
I can't find the definition of "taking in each other's washing" in my dictionary. What does it mean? Thanks!
I think it means "pleasing each other". Is it right?