big league (plural big leagues)

1. A major league.

big league

1. Major league (pertaining to the highest level of professional sports).

   He made a real big league play.

2. Major league (significant, important).

big league (not comparable)

1. (slang) To a significant degree; on a large scale.
   • 2015, Donald Trump, (Please provide the book title or journal name):

     Iran is taking over Iraq, and they’re taking it over big league.