big leagues
An area, echelon, or sphere of great competition, success, power, achievement, etc. Refers to major (i.e., "big") leagues of sports teams. I know you're new here, but you need to perform much better than that. You're in the big leagues now. Welcome to the big leagues, senator. With this promotion, you'll be working in the big leagues. Can you handle it?
big-league
Describing or indicative of the highest level of something. That's a tough injury to come back from—I wonder if he'll ever be a big-league pitcher again. Welcome to the Senate, John. You're a big-league politician now. If we could get a big-league actor like him to sign onto our movie, people might actually go and see it!
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