pushing an opponent out of the ring from behind (sumo) — a sumo term for forcing an opponent out of the dohyo from the rear.
あの力士は送り出しで相手を土俵の外に出した。
That rikishi pushed his opponent out of the ring with an okuridashi.
送り出しは背後からの力の入れ方が重要だ。
Okuridashi requires proper application of force from behind.