力士は胸喉脇または腕を押して、対戦者を土俵の外に出します。
力士が途中まで対戦者の廻しを掴んでいても、力士が土俵際で対戦者の廻しを離し、力士が対戦者を押せば押し出しになります。
The sumo wrestler pushes the chest throat side or the arm and sends the opponent outside a sumo ring.
Even if a sumo wrestler catches a mawashi of the opponent halfway, a sumo wrestler separates a mawashi of the opponent at an edge of the sumo ring and pushes if a sumo wrestler overwhelms the opponent.

PS.
I remake the picture which I showed early of bad quality.