guest-rope

or guest rope

[gest-rohp]
noun Nautical.
  1. a rope suspended from the side of a vessel or a boom as an object to which other vessels can moor, or to afford a hold for persons in such vessels.
  2. a line sent out from a vessel to a fixed object or a buoy or anchor to help the vessel in warping.
  3. a line, in addition to the towrope, to steady a boat in tow.

Origin of guest-rope

1615–25; guest < ? + rope
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018