“Dust you are, and unto dust you shall return,” said the Lord God to Adam after the first sin. It’s a fine translation of the Hebrew, that  dust ; it suggests transience and insubstantiality. By the nineteenth century, in Britain at least, the word came to denote garbage of any sort. So Mr. Boffin in Dickens’  Our Mutual Friend is called The Golden Dustman because he has inherited several enormous mounds of  dust , apparently worth a great deal. The first time I read the book, I wondered—what on earth could be so valuable about dust? We would now call it  trash,  as Shakespeare did. “Who steals my purse steals trash,” says the evil Iago, and that’s a phrase that strikes the British ear as decidedly quaint. The boy in the back row sniggers. “Trash? Wha’ in all Lon’on is  trash ?”

Word of the Day The word is a distant cousin of ancient Greek  thymos,  meaning “spirit,” not in the sense of one’s soul, but rather what we’d call drive, ambition,  fire.  How do we get from there to here? Grimm’s Law helps, as always. Grimm’s Law says that if you sprinkle fairy dust over your shoulder—no, it doesn’t say that. It relates the Proto-Indo-European  th to Germanic  d . In one of these essays I’ll explain why. So what shows up in Greek and Latin as  th  will reliably show up in Germanic as  d.  Hence all we have to account for now is the nasal consonant  m.

“But wait!” says a homeschooled lad in the sixth grade. “You mentioned Latin  th . But there aren’t any original Latin words with a  th.  Everybody knows that!” Quite so, young man. And that requires explanation. When a sound  should show up  in a language but doesn’t, we have two ways of accounting for the absence. One is that the sound simply dropped out. People found it hard to say, maybe, or they figured they could do without it, or nearby speakers of a different language didn’t use it: so we no longer pronounce the  in  knee.  The other is that the sound was transformed into another and somewhat similar sound. Children help us out here. When my son was a very little boy, he’d say “fin” for “thin” and “vat” for “that.”  He was substituting a labiodental unvoiced spirant (f) for the interdental unvoiced spirant (th). That sure clears everything up! Try it, though, and you’ll see how it could happen. The Romans had no words beginning with  th , but they did have a lot of words beginning with  f, not all but some of which  corresponded to Greek words in  th . So then: Greek  thymos =  Latin fumus, smoke ; English  fume  comes from the French, in the Middle Ages.
Back to  dust:  what happened to the  m?  Well, we know it was there, but by the time of Old English it had dropped away. But the Germans, a little more isolated, preserved the nasal consonant:  Dunst: dust, mist, fume.  All of which suggests a revision to the old folk song:

Are you going to Scarborough Fair?
Parsley, sage, rosemary, and dust –

No, it doesn’t work for me either.

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