From Longman Dictionary of Contemporary Englishumpump /ʌmp/ noun [countable] American English spokenx-ref an umpire
Examples from the Corpus
ump• The left-field line ump stayed out of it.• Scott Brosius was ejected in the sixth inning during an argument with home plate ump Larry Barnett.• For the second consecutive game, a ruling by the umps helped determine the outcome.• The umps refused to take any action.Origin ump (1900-2000) umpire 