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Definition umpire in American English

umpire noun

[countable] noun
/ˈʌmˌpaɪr/
1

someone whose job is to make sure that players obey the rules in some sports, for example tennis and baseball. Someone who does this in other games, such as football and basketball, is called a referee.

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2

someone who is asked to decide which person is right in an argument

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Definition umpire in American English