Perhaps I am just a weirdo, but isn't sofa used when there is a sofa-bed within it (like a pull out one?) That's what I would think if someone said sofa. But couch is just a plain piece of sitting furniture, no hidden contraptions. ??
I hope once heard a couch was more casual and a sofa was more formal. I haven't heard of the bed being the deciding factor but it would make sense that a more formal piece of furniture wouldn't have a pull out in it. I'm still team sofa, across the board.
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