Cinch
Rope that passes between two bound columns, or hooks a band of rope, to add tension and lock the wraps in place; Japanese kannuki.
A cinch is rope that runs between two columns and catches the rope on the far side (Rope365), or more generally hooks a band of rope to tighten it (Shibari Study). It is the defining feature of a double-column tie, where it keeps the cuff from slipping or turning (Anatomie Studio; Shibari Study), and it is also used in box ties such as the gote to add tension to the wraps. The Japanese term is kannuki, the word for a latch or gate bar. Andrea Ropes also records other Japanese names for cinching rope, including tome nawa, stop rope, and shibori nawa, squeezing rope.