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tumbling barrel

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noun
  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.
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Origin of tumbling barrel

First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018