—v.i. 1. to perform the office of a member of the clergy, as at a divine service.
2. to perform the duties or function of some office or position.
3. to serve as referee, umpire, or other official in a sports contest or game.
—v.t. 1. to serve as the priest or minister of (a divine service, religious ceremony, etc.).
2. to perform, carry out, or fulfill (an official duty or function).
3. to act as a referee, umpire, timekeeper, or other official for (a sports contest or game).