kingpin

 : 
Noun
 : 
king=pin

WORDNET DICTIONARY

Noun kingpin has 3 senses

OXFORD DICTIONARY

kingpin, n.
1 a a main or large bolt in a central position. b a vertical bolt used as a pivot.
2 an essential person or thing, esp. in a complex system.


For further exploring for "kingpin" in Webster Dictionary Online


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