Umpiring p. pr. & vb. n. : of Umpire

Example:
What to remember when Umpiring minor league games?

Taxonomy
umpire, Crew, MLB, game, Major League, Crew Chief, Major League Baseball, Class AAA, umpire schools, leagues, evaluation course, balls, plate, home run, instant replay, 2007-05-05, baseball, foul.

Defination from the web:
umpire is the person charged with officiating the game, including beginning and ending the game, enforcing the rules of the game ... There are numerous organizations that test or train anyone interested in umpiring for local leagues, and can help make connections to the leagues ...