éminence grise

Related to éminence grise: gray eminence

éminence grise

Someone who is powerful in a particular area without having an official title. The phrase, French for "grey eminence," originally applied to one of Cardinal Richelieu's advisors, a monk who wore a grey robe. A: "Why should I worry about what Bob thinks? He doesn't even have a title!" B: "Yes, but he's the éminence grise of the firm, and the partners really value his opinion."
See also: eminence
Farlex Dictionary of Idioms.
See also:
  • eminence
  • great minds
  • great minds think alike
  • a penny for them
  • be twiddling (one's) thumbs
  • be twiddling your thumbs
  • (as) sure as eggs (is eggs)
  • no cigar
  • not tonight, Josephine
  • but for the grace of God