noun
winning wrestler who stays ringside
Sumo term: the wrestler who won the previous bout and remains at the ringside in case his participation is needed for pre-bout rituals of the next match.
勝ち残りは土俵下で次の取組の準備を手伝う。
The winning wrestler who stays ringside helps with preparations for the next bout at the ringside.
Compound of 勝ち (winning) and 残り (remaining), literally 'remaining as the winner'.