Mill(noun) a building or collection of buildings with machinery by which the processes of manufacturing are carried on; as, a cotton mill; a powder mill; a rolling mill. Mill(noun) a hardened steel roller having a design in relief, used for imprinting a reversed copy of the design in a softer metal, as copper.
The Greek goddess of the hearth and home was Hestia. She was formerly one of the twelve Olympians until she stepped down and gave Dionysus her throne so she could tend to Olymâ¦pus's hearth. Her Roman name was Vesta.
I think it might originate from Home is where the hearth is Hearth meaning floor of the fireplace ( wikipedia: Hearth.) The phrase would then mean that Home is where one cooks meals / gather to eat and would make more sense than the now modern...