twofold purchase

noun

variants or twofold tackle

: a tackle of two double blocks with the standing part of the rope fast to the block from which the hauling part comes

the twofold purchase … is commonly used for hoisting boats

—Manual of Seamanship

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now