Tsuri-otosu 吊り落とす
A suspension drop: the suspended person is lowered quickly and brought to a stop before reaching the ground.
Shibari Study glosses tsuri-otosu (吊り落とす) as a hanging drop or suspension drop: the suspended person falls fast and the rope arrests the fall short of the floor. Drops of this kind are part of dynamic suspension. Ropejam Studio teaches controlled drops only progressively, in an advanced course, notes that a drop is more than simply letting go, and says it does not teach or encourage unplanned drops.