Definitions for kingpinˈkɪŋˌpɪn
Random House Webster's College Dictionary
(in bowling) the headpin. the pin at the center.
Informal. a person or thing of chief importance.
either of the pins that are a part of the mechanism for turning the front wheels in some automotive steering systems.
Origin of kingpin:
kingpin, top banana, bigwig(noun)
the most important person in a group or undertaking
kingbolt, kingpin, swivel pin(noun)
bolt that provides a steering joint in a motor vehicle
the front bowling pin in the triangular arrangement of ten pins
The axis around which steered wheels pivot; a bolt that holds the axis in placeu2014a kingbolt.
The pin at the centre of the triangle of bowling pins (originally the tallest pin in kayles). Sometimes also the headpin at the apex.
The most important person in an undertaking or organization.
The bolt holding together the truck of a roller skate or skateboard.