tumbling barrel: Meaning and Definition of

tum'bling bar"rel

Pronunciation: [key]
  1. a rotating drum for subjecting materials or small manufactured objects, loosely placed inside, to a tumbling action, as to mix materials or to polish objects by friction with one another or with an abrasive.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.