twofold purchase

noun Machinery, Mechanics.

a purchase using a double standing block and a double running block so as to give a mechanical advantage of four or five, neglecting friction, depending on whether the hauling is on the standing block or the running block.

Nearby words

  1. two-wheeler,
  2. two-word verb,
  3. twoccing,
  4. twofer,
  5. twofold,
  6. twolegged,
  7. twonie,
  8. twoonie,
  9. twopence,
  10. twopenny Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019