Well, "schmettern" (verb) literally means to smash or to belt something. "Schmetterling" comes from the old Slavic "Schmetten", meaning cream (the one you skim off milk), but it sounds more like it comes from "schmettern", which is a word still in use.
Well, "schmettern" (verb) literally means to smash or to belt something. "Schmetterling" comes from the old Slavic "Schmetten", meaning cream (the one you skim off milk), but it sounds more like it comes from "schmettern", which is a word still in use.