big shot
big gun
big wheel
big cheese
big deal *
big enchilada
big fish
head honcho

Just me and the big cheese on top of the mountain with the dead.

The big cheese, the actual guy who had to run for election.

I want to have my abilities made use of by the big cheese.

Not often we get a big cheese like you in here.

A big cheese is a boss or other senior person, particularly in an organization.

When we start the hearing phase, he's the big cheese.

Time now for what the evil doctor would call the big cheeses?

His father was a big cheese with the paper.

Instead I got hard bread and a piece of cheese no bigger than two fingers.

But what about when the big cheese showed up?