Probably from an unused root apparently meaning to dig; a pit, especially for catching animals -- hole, pit, snare.
H6354. pachath
מַּ֫חַת noun masculine2 Samuel 18:17 (in 17:9 read בְּאַחַד) pit; — ׳פ absolute Jeremiah 48:43 +, מָּ֑חַת 48:28; plural מְּחָתִים 2 Samuel 17:9; — pit, 17:9; 18:17; Jeremiah 48:28 (Gie question text); figurative of calamity וָפ ׳מַּחַד וָפָ֑ח 48:43 compare 48:44; 48:44 = Isaiah 24:17 compare 24:18; 24:18 and Lamentations 3:47.