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Meaning of jack rope

jack' rope"

Pronunciation: [key]
— Naut. Naut.
  1. a rope for bending the foot of a sail to a boom.
  2. a 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.