niður

From Old Norse niðr, from Proto-Germanic *niþer, from Proto-Indo-European *niter. Cognates include Danish and Swedish ned, English nether, Dutch neder, German nieder.

niður (not comparable)

1. down

• IPA^(key): /ˈnɪːðʏr/
• Rhymes: -ɪːðʏr

From Old Norse niðr, from Proto-Germanic *niþer, from Proto-Indo-European *niter. Cognates include Danish and Swedish ned, English nether, Dutch neder, German nieder.

niður (not comparable)

1. down, downwards

   Hlauptu upp og niður stigann hundrað sinnum!

   Run up and down the stair a hundred times!

Inherited from Old Norse niðr.

• niðji (more common)

niður m (genitive singular niðs or niðjar, nominative plural niðjar)

1. descendant

• Ásgeir Blöndal Magnússon (1989) Íslensk orðsifjabók, Reykjavík: Árni Magnússon Institute for Icelandic Studies, →ISBN (Available at Málið.is under the “Eldri orðabækur” tab.)
• Kristín Bjarnadóttir, editor (2002–2025), “niður”, in Beygingarlýsing íslensks nútímamáls [The Database of Modern Icelandic Inflection] (in Icelandic), Reykjavík: The Árni Magnússon Institute for Icelandic Studies
• Mörður Árnason (2019) Íslensk orðabók, 5th edition, Reykjavík: Forlagið
• “niður” in the Dictionary of Modern Icelandic (in Icelandic) and ISLEX (in the Nordic languages)

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

niður m (genitive singular niðar, no plural)

1. murmuring, hubbub

   Synonym: kliður

2. burbling, gurlging (the sound of running water)