1.NounA twisted strand of fibre used for knitting or weaving.
2.NounBundles of fibres twisted together, and which in turn are twisted in bundles to form strands, which in their turn are twisted or plaited to form rope.
3.NounA story, a tale, especially one that is incredible.
"spin a yarn"
4.VerbTo tell a story or stories, especially one that is lengthy or unlikely to be true.