the world > space > shape > unevenness > condition or fact of receding > condition or action of indentation of edge > indent the edge of [verb (transitive)] > knurl or mill (2)
transitive. To produce a uniform marked edge on (a coin or any piece of flat metal) by machine; to create regular grooves or similar markings on the…
transitive. To make knurls, beadings, or ridges (on the edge of a coin, a screw-head, etc.); to mill, to crenate.