jewel block

American  

noun

Nautical.

1. a block at the end of a yard or gaff for supporting a signal or ensign halyard.

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Etymology

Origin of jewel block

First recorded in 1760–70

Example Sentences

Having lost our outer jib, however, from its blowing away in the first squall, a new one had to be fitted and bent on; and as we were hoisting studding sails, too, the jewel block on the main-topsail yard carried away.

From Project Gutenberg

"I know the main truck from a jewel block," Laurel replied complacently.

From Project Gutenberg