Longman Dictionary of Contemporary English homepage

kingpin

 noun
     
Related topics: Technology
king‧pin [countable usually singular]
1 the person or thing in a group that is the most important or that has the most power - used especially in news reports
crime/drug etc kingpin
a mafia kingpin
2 technicalT a thin strong piece of metal used in hinges
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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