the most intelligent person in a group, especially the person who plans what the group will do

My little brother's the brains of the family. 我们家数我弟弟聪明。

He was the face of the brand but his sister was the brains behind the operation.

The brains behind the scheme is Tom Walker.

He was said to be the brains of the outfit and his brother, the brawn.

Lucy Jones is the brains behind the project.

See also: brain noun