You searched for: “to tread
A unit related to: “to tread
(Latin: lime, calcium; heel, bone of the tarsus; to tread; derived from calx, calcis, "limestone, lime, pebble"; from Greek words halix and psephos, "small stone, pebble".)
(Latin: sole of the foot; to tread down with the sole or the flat bottom or the underside of the foot; and by extension, to level the ground for sowing seeds)