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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Words nearby twofold purchase
two-faced, two-family house, twofer, two-fisted, twofold, twofold purchase, two-four, two-four time, two-glass test, two-handed, two-hander
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020