King James Dictionary

Buttocks The seat; the posteriors; the rear end. And the LORD said, Like as my servant Isaiah hath walked naked and barefoot three years for a sign and wonder upon Egypt and upon Ethiopia; so shall the king of Assyria lead away the Egyptians prisoners, and the Ethiopians captives, young and old, naked and barefoot, even with their BUTTOCKS uncovered, to the shame of Egypt. (Isa 20,4)