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English definition of “big league”

big league

noun [C usually singular]     informal
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. [before noun] We're not playing at local politics here - this is big-league stuff.Important and essential thingsInformation and messages in the US, a group of professional sports teams that compete at the highest level, especially in baseball
(Definition of big league noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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