Ring
Sumo Ring, Arena, Sumo Arena
noun
On the soil we put sacks in a circle to mark the ring or arena in sumo. Go look up some pictures of this word in Japanese and you'll see exactly what we mean. Better yet, go see some live sumo!
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
誰かが土俵にパンの欠片を投げ込みました。
Someone threw a piece of bread into the sumo arena.