A noun appearing as [ᴹQ.] ataltare “collapse” in the Quenya Verbal System (QVS) from 1948, a noun form of the verb atalta- (PE22/110). In Tolkien’s later writings, he used atalantë for “collapse” (MC/223).
Qenya
talan
noun. floor, ground
talat
noun. sheet
talta-
verb. to slope, slip (down), slide down, fall
ataltare
noun. collapse
tál
noun. foot; bottom
A word for “sheet” in the Declension of Nouns (DN) from the early 1930s of unclear derivation.
Conceptual Development: In Early Qenya Word-lists of the 1920s, ᴱQ. talat was “dry land” (PE16/139). The word talat also appeared (unglossed) in notes on The Feanorian Alphabet from the mid-to-late 1930s (PE22/20).