From Middle English boterop, botrop, equivalent to boat + rope.
boatrope (plural boatropes)
- A rope used for the rigging of a boat.
2016, Capt. C W Malins RN, Away Seaboat:The seaboat is fully manned and half way to the water down the ship's side, on deck a team of hefty sailors stand ready with the boatrope in hand poised for the seaboat to hit the water.