ump

noun1

1. •
   (informal) An umpire.

   • If you take it to court, you're the guy who screams at the ump ’cause they don't like the call at the plate. — 2006

verb1

1. •
   To act as an umpire (in).

   • On the block when we were growing up we called him Ronnie the Enforcer because he umped all the stickball games and reffed the hockey. — 1982

noun1

1. •
   Initialism of uridine monophosphate.