Definitions from Wiktionary (kingpin)

▸ noun:  (transport) The axis around which steered wheels pivot; a bolt that holds the axis in place—a kingbolt.
▸ noun:  (transport) The pivot or connector between a tractor and trailer in the fifth-wheel coupling of semi-trailer truck.
▸ noun:  (informal) The most important person in a usually evil undertaking or organization, often a druglord.
▸ noun:  (ten-pin bowling) The pin at the centre of the triangle of bowling pins (originally the tallest pin in kayles). Sometimes also the headpin at the apex.
▸ noun:  The bolt holding together the truck of a roller skate or skateboard.
▸ Also see kingpin

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