noun
waiting wrestler's sitting cushion
In sumo, the cushion placed at ringside for the next wrestler to sit on while waiting for their bout.
次の力士が場所布団に座って出番を待っている。
The next wrestler is sitting on the waiting cushion, waiting for his turn.
Compound of 場所 (basho, 'place; sumo tournament') and 布団 (futon, 'cushion; mattress'). The term is specific to sumo.