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Explanation: émi·nence grise
Inflected Form(s): plural éminences grises /same/
Etymology: French, literally, gray eminence, nickname of Père Joseph (François du Tremblay) died 1638 French monk and diplomat, confidant of Cardinal Richelieu who was known as Éminence Rouge red eminence; from the colors of their respective habits
: a confidential agent; especially : one exercising unsuspected or unofficial power