Definition of high muck-a-muck in English:

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high muck-a-muck

(also high muckety-muck)

noun

North American informal
A person in a position of authority, especially one who is overbearing or conceited: a high muck-a-muck at the CIA
More example sentences
  • He also was the son of a high muck-a-muck in the Nixon administration so he could have had info to pass on before he got his job in the White House.
  • I'm lunching with Josh Jones, one of the high muck-a-mucks of Dreamhost, the company that hosts this website on its massive servers.

Origin

Mid 19th century: perhaps from Chinook hiyu 'plenty' + muckamuck 'food', from Nootka ḥayo 'ten' + ma˙ho˙maq- 'choice wheatmeal', with high substituted for hiyu.

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