O-soto-otoshi
(major outer drop)

"Tori steps out close to Uke's right side with his left foot, transfers his weight to that foot then swings his right leg through the gap between the two bodies lifting it high. Then the right leg is driven back down between Uke's legs so that the foot touches the floor and Uke's right leg crumples. At the same time Tori's arms push Uke down and to the rear "