noun
timekeeper judge; judge timing the matches
In sumo, the judge responsible for timing the matches, ensuring they start and end on schedule.
時間係審判が土俵に上がり、制限時間を告げた。
The timekeeper judge stepped onto the ring and announced the time limit.
Compound of 時間 (time) + 係 (person in charge) + 審判 (referee/judge).