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

The big wheels only used to last a few years.

At first I wanted to put big 20-inch wheels on it.

The man inside was a big wheel in the Organization.

The big wheels and the power - that was what she saw.

But, look, I have to go out to the airport and meet a big wheel who is coming in.

The big wheels had begun to move at the far end of the room.

You could see the big wheels parked in the drive way!

Some other big wheel or wheels decided to take over Joe's part of the business.

A big wheel stuck onto a wall in the middle of nowhere.

The Soul's biggest problem is the ride, at least on those big 18in wheels.