back-room boys
ˈback-room boysBrE 
NAmE 
noun [plural] (BrE)people who do important work for a person or an organization but who are not well known themselves
Much of a racing driver's success is due to the back-room boys.
ˈback-room boysBrE NAmE noun [plural] (BrE)people who do important work for a person or an organization but who are not well known themselvesMuch of a racing driver's success is due to the back-room boys.
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