obsess
definition
to preoccupy or fill the mind of someone to an excessive degree
example
She tends to obsess over every detail of her work, worrying if it's perfect enough.
synonyms
preoccupyconsumeengage
word origin — The word 'obsess' originates from the Latin 'obsidere,' which means 'to besiege' or 'to sit before,' composed of 'ob-' (before) and 'sidere' (to sit).