develop a fixation

Translations
развить навязчивую идею
He developed a fixation with collecting stamps.
Он развил навязчивую идею с коллекционированием марок.
Definitions
To develop a fixation means to become excessively focused or obsessed with a particular idea, object, or person, often to the detriment of other interests or aspects of life.
Words
develop

verb
развить
a

article or possessive pronoun
неопределённый артикль
fixation

noun
фиксация