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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.

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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