the.com/rattling
The sound of something loose, fast, or quietly falling apart.
means Making a rapid series of short, sharp knocking sounds, often from loose parts shaking together.
from From Middle English ratelen, an echo of the noise itself — a word that simply sounds like what it does, like buzz or click.
Snake editionRattlesnake tails are hollow keratin segments, not seeds.
Old slangA rattling good time meant brisk, lively, excellent.
OnomatopoeiaThe word literally imitates the sound it names.