From bo'r; a stench -- stink.
see HEBREW bo'r
H889. beosh
בְּאשׁ noun masculine stench — ׳בּ construct Amos 4:10; suffix בָּאְשׁוֺ Joel 2:20; בָּאְשָׁם Isaiah 34:3; — ׳בּ מַחֲנֵיכֶם, i.e. stench of corpses Amos 4:10, also Isaiah 34:3; compare Joel 2:20 of locusts בּ ׳עָלָה "" צַחֲנָתוֺׅ (תַּעַל.