פירוש על שופטים 9:53

A pestle shard. A fragment of upper grinding stone called "pestle" [lit. "rider.¹⁶As the upper pestle stone “rides” the lower mortar stone. (Metzudos).].

And smashed. Crushed.¹⁷תָּרָץ is usually translated as “ran”. Here, however, the translation is “crushed”, or “smashed”.