back of one's mind
The remote part of one's mind or memory, as in With the idea of quitting in the back of his mind, he turned down the next assignment. [c. 1900]
Words nearby back of one's mind
back o' bourke,
back of,
back of beyond,
back of bourke,
back of one's hand,
back of one's mind,
back off,
back office,
back on one's feet,
back order,
back out