obsess.
To be preoccupied with a single topic or emotion.
Meaning & usage
To be preoccupied with a single topic or emotion.
Some people are obsessed with sports.
To dominate the thoughts of someone.
Thoughts of her obsess my every waking moment.
To think or talk obsessively about.
Stop obsessing over it, will you!
Where this word comes from
From Latin obsessus, perfect passive participle of obsideō (“sit on or in, remain, besiege”), from ob- (“before”) + sedeō (“to sit”); see sit, session, etc.; compare assess, possess.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.