Ã©Minence Grise Meaning
(idiomatic) A secret or unofficial decision-maker; the power behind the throne.
Example: 1987 July 12, John A. Garraty, "Harry's Luck" (book review of Harry Hopkins: Ally of the Poor and Defender of Democracy by George McJimsey), New York Times (retrieved 4 Sep. 2011):
But Harry Hopkins was no mere manipulator of people and ideas, no eminence grise masterminding the actions of figureheads.
2009 Sept. 16, Coco Masters, "New Prime Minister â€” and New Shadow Shogun," Time:
Ozawa is the Secretary-General of Hatoyama's Democratic Party of Japan (DJP) and the Ã©minence grise of the electoral campaign that catapulted the new Prime Minister to power.