Definition of muckety-muck in English:

muckety-muck

Syllabification: muck·et·y-muck
Pronunciation: /ˈməkətē ˌmək/

Entry from US English dictionary

(also mucky-muck /ˈməkē ˌmək/ or muck-a-muck /ˈmək ə ˌmək/)

noun

informal
  • A person of great importance or self-importance: a big Hollywood muckety-muck

Origin

mid 19th century: from Chinook Jargon, shortening of high muck-a-muck.

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