éminence grise
noun
émi·nence grise
ā-mē-näⁿs-ˈgrēz
plural éminences grises
ā-mē-näⁿs-ˈgrēz
1
: a confidential agent
especially
: one exercising unsuspected or unofficial power
2
: a respected authority
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Merriam-Webster unabridged
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