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.
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Nearby words
- two-wheeler,
- two-word verb,
- twoccing,
- twofer,
- twofold,
- twolegged,
- twonie,
- twoonie,
- twopence,
- twopenny
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019