In a 1987 'Advanced Dungeons & Dragons' role-playing game accessory ("Book Of Lairs II" by various authors), and specifically in a scenario where humans are chasing a leprechaun down man-sized warren tunnels, I have:
the din has obviously been smoothed [over the trap]
he shows them which rock to roll away from the din wall [to reveal the secret handle].
Does "din" have a meaning other than "loud noise"? Could it be a double transcription/OCR error (my guess), and if so, what was the word most likely used originally?