umps is ump's Plural Form

ump

US [ʌmp]
UK 
  • abbr.(=uridine monophosphate)【化】一磷酸尿苷
  • n.裁判员
  • v.当裁判
  • WebUser-Mode Power Service; 尿嘧啶核苷酸合成酶
Plural Form：umps  Present Participle：umping  Past Tense：umped  

Synonym

E-C

E-E

Web Definition

n.
1.
裁判员
v.
1.
当裁判,当裁判
abbr.
1.
【化】(=uridine monophosphate)一磷酸尿苷,尿苷酸