(Exodus 32:20; Deuteronomy 9:21; Judges 16:21), to crush small (Heb. tahan); to oppress the poor (Isaiah 3:5). The hand-mill was early used by the Hebrews (Numbers 11:8). It consisted of two stones, the upper (Deuteronomy 24:6; 2Sam 11:21) being movable and slightly concave, the lower being stationary. The grinders mentioned Eccl 12:3 are the teeth. (See MILL .)
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain, copy freely.
Easton, Matthew George. "Entry for 'Grind'". "Easton's Bible Dictionary".