What does "ump" mean?

Initialism of uridine monophosphate.

What is a synonym for "ump"?

Common synonyms include: umpire, arbiter, official, referee.

/ʌmp/ name, noun, verb, slang

name, noun, verb, slang ·Moderate ·College level

Noun

1
Initialism of uridine monophosphate. abbreviation, alt-of, initialism, uncountable
2
An umpire. informal
"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."
3
an official at a baseball game wordnet

Verb

1
To act as an umpire (in). ambitransitive
"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."

Proper Noun

1
The Union for a Popular Movement. French
"Some commentators wondered if Dati was being used as part of an internal battle between Fillon and the head of Sarkozy's UMP party."

"Some commentators wondered if Dati was being used as part of an internal battle between Fillon and the head of Sarkozy's UMP party."

Etymology 1

Borrowed from French UMP (“Union pour un Mouvement Populaire”).

Etymology 2

Clipping of umpire.