1Yarn obtained by untwisting rope strands, or used for making ropes.
2A single yarn forming part of a strand in a rope; a piece of yarn obtained by unpicking an old rope.
Designating a day given as a holiday or (especially) a half holiday. "rope-yarn Sunday": any of various days or afternoons in the week given as a holiday. Chiefly Naut. slang.
Late Middle English. From rope + yarn.
rope yarn/ˈrəʊp jɑːn/
We take a look at several popular, though confusing, punctuation marks.