ˈ ̷ ̷ˌ ̷ ̷ noun
1. : any of several bowling pins: as
a. : headpin
b. : the number 5 pin
2. : one that holds a chief or most prominent place in a group or undertaking
kingpin of the great steel industry — F.L.Allen
sought by the government … as the kingpin of dope peddlers — Associated Press
recognized kingpin in the tailor-made car field — Ethyl News
3.
a. : kingbolt 1
b. : knuckle pin
4. : one that holds together a complex system or arrangement
the … chancellor is fully aware of the fact that he is the kingpin of the constitutional setup — C.J.Friedrich & H.J.Spiro