From Middle English doun, from Old English dūne, aphetic form of adūne, from ofdūne. For the development from directional phrases to prepositions, cf. Middle Low German dāle ("(in/to the) valley"), i.e. "down(wards)".
From Middle English doune, from Old English dūn, from Proto-Germanic *dūnaz, *dūnǭ, probably borrowed from Proto-Celtic *dūnom ("hill; hillfort") (compare Welsh din ("hill"), Irish dún ("hill, fort")), from Proto-Indo-European *dʰewh₂- ("to finish, come full circle"). Cognate with West Frisian dún ("dune, sandhill"), Dutch duin ("dune, sandhill"), German Düne ("dune"). More at town; akin to dune.
From Middle English doun, from Old Norse dúnn, from Proto-Germanic *dūnaz ("down"), which is related to *dauniz, from Proto-Indo-European *dʰowh₂-nis, from the root *dʰewh₂-.
Cognate with Saterland Frisian Duune ("fluff, down"), German Daune ("down") and Danish dun ("down").
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