Two wires at the time of crossing. Also called twisting or spinning. Twining is the oldest textile technique in the world. Originally done by rubbing a fiber over the thighs by hand. Two wires twisted around each other are much stronger than a single wire. A wire or, in the case of slightly thicker material, a rope. The twine. The first commodity in the world?
“strong thread made from twisted strands,” Old English twin “double thread,” from Proto-Germanic *twiznaz “double thread, twisted thread” (source also of Dutch twijn, Low German twern, German zwirn “twine, thread”), from PIE root *dwo- “two.”
“to twist strands together to form twine,” c. 1300, from twine (n.) and probably also from Old Norse tvinna “to double.” Sense of “to twist around something” (as twine does) is recorded from late 14c. Related: Twined; twining.