ציטירנדיקער פּירוש אויף ישעיהו 41:15

לא יחרץ כלב לשנו NO DOG SHALL חרץ HIS TONGUE — I say that it has the meaning of sharpening: “no dog shall whet his tongue”. So, too: (Joshua 10:21) “לא חרץ his tongue against any of the children of Israel”, i. e. “none whetted”; (II Samuel 5:24) “then תחרץ” — then thou shalt utter a sharp sound; (Isaiah 41:15) “a threshing-sledge חרוץ” i. e. sharp; (Proverbs 21:5) “the plans of a חרוץ” — of “an acute and sharp man”; (Proverbs 10:4) “the hand of the חרוצים maketh rich”, i. e. the hand of the acute — of sharp merchants.

and the threshing tools for [fire] wood [These are] boards with which they thresh the grain, as we learned in Avodah Zarah (24b): “A goat with hooks,” [which is the] name of a threshing-sledge, similar to (Isa. 41:15): “a new grooved threshing sledge (מוֹרַג חָרוּץ).”

בחרוץ With a threshing instrument. Comp. 41:15.

with a grooved [implement] That is a wooden implement, made with grooves, and its name is מוֹרַג, a threshing-board, and one cuts the straw with it to be straw fodder.