at the back of your mind

US /æt ðə bæk əv jʊər maɪnd/
UK /æt ðə bæk əv jʊər maɪnd/
"at the back of your mind" picture
1.

на задворках сознания, в глубине души

a thought or worry that you have but that you are not thinking about consciously

:
The thought of the upcoming exam was always at the back of her mind.
Мысль о предстоящем экзамене всегда была на задворках ее сознания.
He had a nagging feeling at the back of his mind that he had forgotten something important.
У него было навязчивое чувство на задворках сознания, что он забыл что-то важное.