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sand jack

American  

noun

Shipbuilding.

  1. any of a number of containers of sand driven beneath a hull about to be launched as a temporary support and then drained of sand so as to let the hull down onto the launching cradle.

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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