jackstay
/ˈdʒækˌsteɪ/
noun
- A rope, wire, or rod used on a ship to support a sail, secure equipment, or provide a handhold.
- The sailor clipped his safety harness to the jackstay while working on deck.
- We ran a jackstay along the boom to keep the sail in place.
- During the storm, the crew used the jackstay to move safely across the ship.