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Noun: backroom boy
Usage: Brit, informal
  1. A male expert adviser involved in making important decisions but usually lacking official status
    "The backroom boy played a crucial role in shaping the campaign strategy"

Derived forms: backroom boys

Type of: adult male, bozo [N. Amer, informal], brain truster [N. Amer], cat [N. Amer, informal], chappie [Brit, informal], geezer [Brit, informal], guy [informal], hombre [N. Amer, informal], man, sod [informal]