covered or soiled with dung (animal waste); extremely dirty or filthy.
From be- (thorough prefix) + dung (from Old Norse dynamr or Old English dung, related to dungeon meaning 'a dark prison'). The prefix intensifies the meaning of being covered in dung.
The word 'dungeon' might come from 'dung' because dungeons were notoriously filthy places—showing how medieval life was absolutely intertwined with waste and unsanitary conditions.
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