Definitions

1. noun

A person or thing that has a dominant influence or control over a particular activity, organization, or situation.

“The CEO was the kingpin behind the company’s rapid expansion.”

2. noun

A person who is the most important or influential member of a group, especially a criminal organization.

“The police were trying to identify the kingpin of the gang.”

3. noun

The chief or most important pin on which something turns or revolves, especially a wheel or other rotating part.

“The kingpin of the wheel was worn out and needed to be replaced.”