at/in the back of one's mind

:  the rear part of the human body especially from the neck to the end of the spine

:  the body considered as the wearer of clothes

:  capacity for labor, effort, or endurance

:  to, toward, or at the rear

:  in or into the past :  backward in time

:  ago

:  being at or in the back

:  distant from a central or main area

:  articulated at or toward the back of the oral passage :  formed deep within the mouth

:  to support by material or moral assistance

:  substantiate

:  to assume financial responsibility for

:  recollection, memory

:  the element or complex (see ¹complex 1) of elements in an individual that feels, perceives, thinks, wills, and especially reasons

:  the conscious mental events and capabilities in an organism

:  remind

:  remember

:  to attend to closely