ump
n. countable B2 Upper Intermediate UK //ˈʌmp// ump
n. the person who makes sure players follow the rules in a sports game, like baseball. It is a short name for an umpire.
n. an official who enforces the rules of a game and settles disputes, primarily in baseball or softball. Informal shortening of 'umpire'.
The ump called the player out at second base.
After the close play at home plate, the manager ran onto the field to argue with the ump.
While the home plate ump focuses on balls and strikes, the field umps must maintain a clear line of sight to every base to monitor potential tags and force outs.
Clipping of umpire.