WordReference Random House Unabridged Dictionary of American English © 2026
jack′ rope′, [Naut.]
- Nautical, Naval Termsa rope for bending the foot of a sail to a boom.
- Nautical, Naval Termsa line that is rove through grommets on the reef band of a square sail, and to which lanyards from the jackstay on the yard are toggled to reef the sail.