big wheel

Etymology
Originally a brand name.

Noun

 * 1)  A person with a great deal of power or influence, especially a high-ranking person in an organization.
 * 2)  A Ferris wheel.
 * 3)  A low-riding tricycle with a large front wheel.
 * 1)  A Ferris wheel.
 * 2)  A low-riding tricycle with a large front wheel.