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fly block

American  

noun

Machinery, Nautical.

  1. (in a Spanish burton or the like) a block, supported by a runner, through which the hauling part of the fall is rove.

  2. any block that shifts with the movement of its tackle.

Etymology

Origin of fly block

First recorded in 1835–45

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.