muckety-muck

Noun

muckety muck (plural muckety mucks)

1. (US, colloquial) A high muckamuck; a person (especially self-important) in a position of power, authority, or status.
   • Consequently, there have been times when the muckety-mucks at Merriam-Webster have requested that we all mark every third or fifth word in at least one source just to fill our files with words that would not usually catch our eye.2017, Kory Stamper, Word By Word, Vintage, published 2018, page 88

   Synonyms:

   baron, big cheese, big enchilada, big gun, big kahuna, big man, big name, big noise, big shot, bigwig