major leagues

/M EY1 JH ER0 L IY0 G Z/
noun
  1. 1

    An association of sports teams which plays at the highest skill level of its sport, especially Major League Baseball.

  2. 2

    (usually in plural or attributive) The highest level of competition in a field of endeavor.

    โ€œYou can't be so casual. You're in the major leagues now.โ€

Source: https://en.wiktionary.org/wiki/major%20league, https://en.wiktionary.org/wiki/major%20leagues