- (in a Spanish burton or the like) a block, supported by a runner, through which the hauling part of the fall is rove.
- any block that shifts with the movement of its tackle.
Origin of fly block
First recorded in 1835–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for fly block
The block secured to the lower end of the tye is the fly-block.The Sailor's Word-Book
William Henry Smyth
Luck is like a fly-block and its yard: when one goes up, the other comes down.The Red Rover
James Fenimore Cooper
The halyards should be a luff purchase, the fly-block being the double block, and the single block being hooked in the channels.
Reeve the end of your rope through the upper block, and make it fast to the strap of the fly-block.
Then make fast your hook to the bight of the rope, and reeve the other end through the fly-block for a fall.