the brains behind something
the brains behind (something)
The person responsible for a certain plan or idea. Sheila is the brains behind our new environmental initiative, so she deserves all the credit. I wonder which of my enemies is the brains behind this latest rumor about me.
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
the ˈbrains behind somethingthe person who thinks of new ideas and makes plans for somebody/something: Everyone knew that she was the real brains behind the operation.
Farlex Partner Idioms Dictionary © Farlex 2017