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kingpin definition

king·pin (-pin′)

noun

  1. 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
  2. the headpin or the center pin in bowling, tenpins, etc.
  3. ☆ Informal the main or essential person or thing

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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