Definitions
1.NounThe axis around which steered wheels pivot; a bolt that holds the axis in place.
2.NounThe pivot or connector between a tractor and trailer in the fifth-wheel coupling of semi-trailer truck.
3.NounThe most important person in a usually evil undertaking or organization, often a druglord.
4.NounThe pin at the centre of the triangle of bowling pins (originally the tallest pin in kayles). Sometimes also the headpin at the apex.
5.NounThe bolt holding together the truck of a roller skate or skateboard.