1. to think about someone or something constantly in a way that is not normal or healthy
Usage: third person singular present tense of ‘obsess’

Examples

• She obsesses over every detail of her appearance.
• He obsesses about getting perfect grades.
• The detective obsesses over unsolved cases.
• My sister obsesses about what people think of her.
• The artist obsesses over each brushstroke.
• She obsesses about her weight constantly.