Definition of “big league” - English Dictionary

“big league” in English

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big leaguenoun [ C ]

uk /ˈbɪɡ ˌliːɡ/ us /ˈbɪɡ ˌliːɡ/ UK informal
adjective [ before noun ]

We're not playing at local politics here - this is big-league stuff.

(Definition of “big league” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“the big league” in Business English

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the big leaguenoun [ S ]

uk us informal

the most important or successful people, companies, etc. in a particular business or area of activity:

They are anxious to move into the big league of pharmaceuticals companies.

(Definition of “the big league” from the Cambridge Business English Dictionary © Cambridge University Press)