BDB1762
מְגֵרָה noun feminine saw (Late Hebrew id., perhaps from its harsh dragging sound) — מְגֵרָה 2Sam 12:31 a + 2 t.; plural מְגֵרוֺת 1Chr 20:3 (< מַגְזְרוֺת 2Sam 12:31 b) — saw, used in cutting stone מְגֹרָרוֺת בַּמְּגֵרָה 1Kgs 7:9 used in torture (or as tools for enforced labour) of captives 2Sam 12:31 a 1Chr 20:3 a.