A verb appearing as ᴱQ. qasa- “shake, flap, nod, rustle” in the Qenya Lexicon of the 1910s under the early root ᴱ√QASA (QL/76). Tolkien gave it the past form qasse after which he marked “(intr.)”. This perhaps indicates there was a distinct transitive past (not given), or that the entire verb was intransitive.

Neo-Quenya: I retain ᴺQ. quas- “to shake, flap, nod” for purposes of Neo-Quenya, but assume it is based on a Neo-Root ᴺ√KWATH so that it retains the same modern form. Its classical form would be quaþ-. For “rustle” I would instead use [ᴱQ.] hyasta-.