A rope or stay that helps support a mast or spar on a ship, running from the mast to the deck or gunwale.
From 'buck' (a support or brace) and 'stay' (a rope securing rigging). This nautical term developed as sailing vessels became larger and more complex, requiring more sophisticated rigging systems.
In stormy seas, buckstays are literally lifelines for ship integrity—they work alongside other rigging to distribute stress across a mast, and a single buckstay failure has historically caused entire masts to collapse.
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