(~s, umpiring, ~d)
1.
An ~ is a person whose job is to make sure that a sports match or contest is played fairly and that the rules are not broken.
The ~’s decision is final.
N-COUNT
2.
To ~ means to be the ~ in a sports match or contest.
He ~d baseball games...
He ~d for school football matches until he was in his late 50s.
VERB: V n, V