Big Cheese Meaning

(idiomatic) A very important figure, especially a high-ranking person in an organization.

Example:   He'll be meeting with the big cheese first thing tomorrow, to present his proposal.
1980, Airplane! (film), Rex Kramer:
  I know. But it's his ship now, his command; he's in charge, he's the boss, the head man, the top dog, the big cheese, the head honcho, number one...