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English definition of “big league”

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big league

noun [C] uk   UK informal us  
( US big leagues) the top level of a particular sport, business, or activity in which there is the greatest competition and the greatest opportunity for success: He is about to join the big league of Formula One in time for the new season. For the magazine to be successful, it will have to compete in the big league against leading weekly women's magazines.^big _leagues in the US, a group of professional sports teams that compete at the highest level, especially in baseball
big league
adjective [before noun]
[before noun] We're not playing at local politics here - this is big-league stuff.
(Definition of big league from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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