Definition of obsess verb from the Oxford Advanced American Dictionary

     

    obsess

     verb
    verb
    NAmE//əbˈsɛs//
     
    Verb Forms present simple I / you / we / they obsess
     
    he / she / it obsesses
     
    past simple obsessed
     
    -ing form obsessing
     
     
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  1. 1[transitive, often passive] obsess somebody to completely fill your mind so that you cannot think of anything else, in a way that is not normal He's obsessed by computers. She's completely obsessed with him. The need to produce the most exciting newspaper story obsesses most journalists.
  2. 2[intransitive] obsess (about something) to be always talking or worrying about a particular thing, especially when this annoys other people I think you should try to stop obsessing about food.
See the Oxford Advanced Learner's Dictionary entry: obsess