Early Quenya
qasa-
verb. to shake, flap, nod, rustle
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
qasa-
verb. to shake, flap, nod, rustle
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-.