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English definition of “Mister Big”

Mister Big

noun [S] uk   humorous us  
the most important person in a place or organization: Paul is Mister Big in our department, so it's important to make a good impression on him.Important people and describing important peopleFamous peopleWealthy people
(Definition of Mister Big from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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