kingpinKK [ˋkɪŋˏpɪn] /ˈkɪŋˌpɪn/發音名詞1首腦、核心人物、關鍵人物口語Police finally arrested the kingpin of the smuggling ring last week.警方上週終於逮捕了這個走私集團的首腦。2主銷、中心立軸機械The mechanic replaced the worn kingpin on the front axle.技師更換了前軸上磨損的主銷。