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Noun: mucky-muck  'mú-kee,múk
Usage: N. Amer, informal
  1. An important or influential person; someone of high rank or holder of an important office
    "The mucky-muck was protected by security";
    - very important person, VIP, high-up, dignitary, panjandrum, high muckamuck [N. Amer, informal], muckamuck [N. Amer, informal]

Derived forms: mucky-mucks

Type of: important person, influential person, personage