If it’s an obsolete word now, was there ever a time it was in regular use? In other words, was there a time people turned into worms all the time?
Only during the wormocalypse
We all turn to worms eventually.
That’s not its only meaning! One of the others is the holes left by woodworm, and it comes up in a Thomas Hardy novel (I think Tess?). I love this word!

Ooh my kind of rock
I skimmed through that article so hard looking for the moment the crystals would turn into a worm. Was disappointed.
The crystals turn into worms when a machines vermiculates them to be used as insulation material
wormyculation
But in German
“Wurmifizierung” or “Verwurmung”
Serious question: when has anything ever turned into a worm?
All I can fathom is if a centipede gets into an accident in which all its legs are amputated.
In the Dune books
Maybe a suicide bomber 😬

I would have to love you first. And since you asked that question, I would say that could never happen.