A narrow lane or sunken path, especially one worn down by long use in a hillside; a defile or mountain pass.
From Middle English and Old Norse origin, possibly related to 'drive' or 'drang' (pressure). The word describes paths literally pushed down into the earth by centuries of foot and hoof traffic.
Walking through an ancient drung, you're literally walking through history—your feet follow in ruts made by thousands of years of animals and people, with the path now several feet below the surrounding ground!
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