Kingpin meaning

kĭngpĭn
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The most important person or element in an enterprise or system.
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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.
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(informal) The main or essential person or thing.
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(motorized vehicles) The axis around which steered wheels pivot; a bolt that holds the axis in place—a kingbolt.
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The headpin or the center pin in bowling, tenpins, etc.
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(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.
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The most important person in an undertaking or organization.
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The bolt holding together the truck of a roller skate or skateboard.
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Origin of kingpin