: a primitive root: meaning either to be gray or perhaps rather to pulverize; used only as denominative from aphar, to be dust -- cast (dust).
see HEBREW aphar
H6080. aphar
[עָפַר] verb denominative Pi`el בֶּעָפָר וְעִמַּר 2 Samuel 16:13 and kept dusting (him) with dust (throwing [lumps of] dry earth at him).
II. עפר (√ of following; compare Arabic young of mountain-goat, Late Hebrew עוֺפֶר young of animals).