leading figure; influential figure; mogul
Refers to a person of great authority and influence in a particular field, often with a connotation of being a veteran or elder statesman. Commonly used in politics, business, and entertainment.
He is known as a leading figure in the political world.
The veteran actor will appear in the new film.
大御所 refers to an established, veteran authority in a field, the opposite of 新進, which describes someone newly rising.
Originally referred to the shogun's retired father or a powerful retired shogun who still held influence. The term later broadened to mean any influential veteran in a field.