umpire
Definitions
An official who enforces the rules and settles disputes in sports such as baseball, cricket, or tennis.
A person chosen to arbitrate or settle a disagreement between two parties.
Examples
The umpire signaled that the batter was out after a close play at first base.
It is the umpire's responsibility to ensure that both teams follow the rules of the game.
The crowd booed loudly when the umpire made a controversial call during the final inning.
Synonyms
referee arbitrator judge adjudicator mediator official arbiter
Antonyms
contestant player competitor participant athlete opponent challenger