Kingpin Definition

kĭngpĭn
kingpins
noun
kingpins
A vertical pin attached to some axles to serve as the axis for a wheel spindle, so that the wheel may be turned for steering.
Webster's New World
The headpin or the center pin in bowling, tenpins, etc.
Webster's New World
The most important person or element in an enterprise or system.
American Heritage

The bolt holding together the truck of a roller skate or skateboard.

Wiktionary
Synonyms:

Other Word Forms of Kingpin

Noun

Singular:
kingpin
Plural:
kingpins

Origin of Kingpin

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