Milling. The felting or fulling of cloth to thicken it. Double-milled cloths are woolen cloths which are fulled or shrunk by being put through the fulling mill twice. [See Fulling] Also a method of softening and opening the pores of hides by placing them in a hollow revolving drum in contact with oil or any ameliorating liquid, whereby the liquid is worked into all parts of the leather. [See Leather]