1. (noun)kingpin, top banana, bigwig the most important person in a group or undertaking Synonyms: kingpin, kingbolt, headpin, swivel pin, bigwig, top banana
2. (noun)kingbolt, kingpin, swivel pin bolt that provides a steering joint in a motor vehicle Synonyms: kingpin, kingbolt, headpin, swivel pin, bigwig, top banana
3. (noun)headpin, kingpin the front bowling pin in the triangular arrangement of ten pins Synonyms: kingpin, kingbolt, headpin, swivel pin, bigwig, top banana