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jack block

American  

noun

Nautical.

  1. a block used in raising or lowering a topgallant yard.

Etymology

Origin of jack block

First recorded in 1785–95

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.