Definitions from Wiktionary (obsess)

▸ verb:  (passive voice, constructed with "with") To be preoccupied with a single topic or emotion.
▸ verb:  (transitive) To dominate the thoughts of someone.
▸ verb:  (intransitive, colloquial, construed with over) To think or talk obsessively about.
▸ Also see obsess

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