linger on (someone's) mind

Translations
засесть в (чьих-то) мыслях
The thought of the accident lingered on her mind for days.
Мысль об аварии засела в её мыслях на несколько дней.
Definitions
To remain in someone's thoughts for a period of time, often causing them to think about it repeatedly or feel preoccupied.
Words
mind

noun
ум
linger

verb
задерживаться
linger on

verb
задерживаться