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dumb sheave

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noun Nautical.
  1. a block having no sheave or other part rolling with the movement of a line.
  2. a groove in a spar or other timber, through which a rope can slide.
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Origin of dumb sheave

First recorded in 1855–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018