From garar; a saw -- axe, saw.
see HEBREW garar
H4050. megerah
מְגֵרָה noun feminine saw (Late Hebrew id., perhaps from its harsh dragging sound) — מְגֵרָה 2 Samuel 12:31 a + 2 t.; plural מְגֵרוֺת 1 Chronicles 20:3 (< מַגְזְרוֺת 2 Samuel 12:31 b) — saw, used in cutting stone בַּמְּגֵרָה מְגֹרָרוֺת 1 Kings 7:9; used in torture (or as tools for enforced labour) of captives 2 Samuel 12:31 a 1 Chronicles 20:3 a.