In the course of history, mankind has been faced with a handful of debates so contentious as to risk tearing apart the fabric of society. Do aliens really exist? What color was that dress? Is the thing you sit on in your living room called a sofa or a couch?

Luckily, that last question does, in fact, have a definitive answer. Which is: a sofa. Not a couch. Period.

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David Tsay
A sofa, not a couch, in a project by Andrew Howard.

Why? Well, according to Merriam-Webster, a "sofa" is defined as "a long upholstered seat usually with arms and a back, and often convertible into a bed." (Not sure why they're so big on sofa-beds, but OK.) "Couch," on the other hand, is simultaneously "an article of furniture for sitting or reclining," "a couch on which a patient reclines when undergoing psychoanalysis" (can you use a word in its own definition?), and "the den of an animal (such as an otter)."

So one of these words refers specifically to an upholstered seat, while the other might likewise be an article of furniture—or where you spend an hour at the shrink, or perhaps the home of an otter. You decide what's more appealing.

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Ngoc Minh Ngo
An O. Henry House sofa—also not a couch—anchors this living room designed by Barrie Benson.

Then there's the fact that the word "couch" just sounds weird. It's like saying "slacks" instead of pants or "purse" instead of handbag. Sure, people will know what you're talking about, but they'll probably think you're a little off.

You don't have to take my word for it, though: In a recent and not-entirely-scientific poll, a full 100 percent of experts—in this case, interior designers—agreed that "sofa" is the preferred nomenclature.

For many of them, the mere mention of a "couch" was met with horror. "It sounds like something covered in plastic at your grandma's house," said Courtney McLeod of Right Meets Left Interior Design. "Couch rhymes with slouch!" proclaimed Timothy Brown.

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Francesco Lagnese
Not just one but two sofas, courtesy of Thomas Jayne.

Per Charleston's Michael Mitchell and Tyler Hill, "'Couch' sounds less expensive, whereas 'sofa' is elegant and reserved." Laura Gregory, president of North Carolina–based upholstery company O. Henry House, felt similarly. "Couch is always more low-end," she explained. "It’s kind of a joke at our house—even my kids will correct people when they say couch!"

Andrew Howard suggested that steps be taken to ensure the proper use of "sofa," stating, "You should not be a designer if you say 'couch,' and I feel strongly about it."

And for Scot Meacham Wood, the debate isn't even a debate at all: "There's nothing to have an opinion about—it's a sofa. Stop. The end."

So there you have it. It's a sofa, not a couch.

(Unless it's a loveseat. Or a settee. Or a banquette. But we'll leave that for another day.)

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