טְרַשׁ I (cmp. טרף) to batter. B. Kam. 98ᵃ מחייה וטַרְשֵׁיה … (Var. טרסיה, v. Rabb. D. S. a. l. note 300) he struck upon the coin with the hammer and battered it (so that the stamp was effaced).
Pa. - טָרֵישׁ (denom. of טֶרֶשׁ) to harden, make brittle. Ḥull. 46ᵇ בקרירי לא דמְטָרְשֵׁי you must not put the lungs in cold water, because it makes the coat of the lungs brittle (so as to crack when you blow them up; [Ar. ed. Koh. בחמימי לא דמט׳ not in hot water because ‘it makes strong’]; v. כְּוַץ.