How and why do these changes occur? I’ll let you in on a little secret: Because you make them happen. Yes, you, right there. You grow impatient with the looks of, say, “rest room” (“I mean, it’s not a room you rest in, is it?”), so you stick a hyphen in it, coexist with “rest-room” for about twenty minutes, then quickly tire of the hyphen and, boom, “restroom.” Multiply this times hundreds of compounds, and watch the language whoosh into the future before your very eyes. Then watch the dictionary keep up with you, because that’s how it works. As a lexicographer friend once confided over sushi,
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I don’t want to talk about how emotional this passage made me but I will.
