kingpin
/ˈkɪŋ.pɪn/ noun C1- The axis around which steered wheels pivot; a bolt that holds the axis in place.
- The pivot or connector between a tractor and trailer in the fifth-wheel coupling of semi-trailer truck.
- The most important person in a usually evil undertaking or organization, often a druglord.
- 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 bolt holding together the truck of a roller skate or skateboard.
Plural kingpins
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