Definition of chair umpire in English:

chair umpire

noun

Tennis
  • The umpire seated on a raised chair behind one of the posts supporting the net, who is the final authority during a match.

    ‘he complained to the chair umpire about the vocal crowd after dropping the fourth set’
    referee, linesman, referee's assistant, assistant referee, judge, line judge, adjudicator, arbitrator, arbiter, moderator, overseer, supervisor
    View synonyms