| 1. | Bowling.
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| 2. | Informal. the person of chief importance in a corporation, movement, undertaking, etc. |
| 3. | Informal. the chief element of any system, plan, or the like. |
| 4. | a kingbolt. |
| 5. | either of the pins that are a part of the mechanism for turning the front wheels in some automotive steering systems. |
kingpin
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