núta- vb. "set, sink" (of Sun or Moon) (NDŪ). In early "Qenya", the word was glossed "stoop, sink" (LT1:263)
Quenya
núta-
verb. to lower, to lower; [ᴹQ.] to set, sink (of Sun or Moon); [ᴱQ.] to stoop
núta-
verb. set, sink
núta
verb. lower
andúta-
verb. to lower
númeta-
verb. get low (of the sun)
númeta- vb. "get low (of the Sun)" (also numenda-) (LT1:263; in Tolkien's later Quenya rather núta-); inflected númetar "set" ("went down in the West") (MC:221; this is "Qenya")
andúta
verb. lower
luvu-
verb. lower, brood
luvu- vb. "lower, brood" (LT1:259)
numenda-
verb. get low (of the sun)
numenda- vb. "get low (of the Sun)" (also númeta-) (LT1:263; in Tolkien's later Quenya núta-)
A transitive (ta-causative) verb appearing as andúta or núta “lower” in Late Notes on Verb Structure (LVS) from 1969, as opposed to intransitive (ya-formative) núya- “descend” (PE22/156). It was clearly based on ✶ndūtā- “cause to sink”, which appeared in Common Eldarin: Verb Structure (EVS2) from the early 1950s (PE22/135).
Conceptual Development: In earlier documents this verb had intransitive meanings, such as ᴱQ. nūta- “stoop, sink” in the Qenya Lexicon of the 1910s under the early root ᴱ√NUHU “bow, bend down; stoop, sink” (QL/68), and ᴹQ. núta- “set, sink (of Sun or Moon)” in The Etymologies of the 1930s under the root ᴹ√NDŪ “go down, sink, set (of Sun, etc.)” (Ety/NDŪ). In the Quenya Verbal System (QVS) from 1948, Tolkien revised intransitive {núta} “come down” to ᴹQ. unta (PE22/125 note #136); see that entry for discussion.
Neo-Quenya: For purposes of Neo-Quenya, I would limit the verb núta- to transitive “lower = ✱cause to sink or go down”. I would use núya- “descend” and [ᴹQ.] unta- “✱sink, stoop” for the intransitive senses.