What is "gyoji"

n. (context sumo English) a referee in a sumo match

A Gyōji (行司) is a referee in professional sumo wrestling in Japan.

Gyōji usually enter the sumo world as teenagers and remain employees of the Sumo Association until they retire aged 65. There are currently a little over 40 active gyōji with an average of one in each sumo stable, though some stables have more than one and some have no gyōji.