Glassmaking

The ninth entry is le marbrage, and the workshop word hidden inside it crossed into English long ago and came out unrecognisable. The noun underneath is le marbre, marble, from the Latin marmor. In a glasshouse le marbre is the flat slab on which the hot gather is rolled until it runs true and even, marbrer is to roll it there, and le marbrage names that operation. English borrowed the same French noun for the same slab and let the sound settle into « the marver », with « to marver » and « marvering » built on top of it. Nobody meeting « marver » on a studio page would guess at marble, and no general dictionary of English carries the word at all, so the link has to be pointed out rather than noticed. The joke lands on both languages equally: the slab has been polished steel for generations, in a French verrerie and in an English hot shop alike, so two trades go on naming a piece of marble that nobody has touched in a century. Only the word kept the stone.