noun
ringside judge (sumo)
A sumo referee who sits ringside and may be called upon to confirm or overrule the referee's decision.
勝負審判が土俵下で取組を見守っている。
The ringside judges are watching the bout from beside the ring.
行司 is the referee on the dohyō who conducts the match, while 勝負審判 are the judges seated around the ring who assist in decisions.
Compound of 勝負 (shōbu, 'match, contest') and 審判 (shinpan, 'judge, referee').