Definition of obsess verb from the Oxford Advanced Learner's Dictionary

     

    obsess

     verb
    verb
    BrE BrE//əbˈses//
     
    ; NAmE NAmE//əbˈses//
     
    Verb Forms present simple I / you / we / they obsess
    BrE BrE//əbˈses//
     
    ; NAmE NAmE//əbˈses//
     
    he / she / it obsesses
    BrE BrE//əbˈsesɪz//
     
    ; NAmE NAmE//əbˈsesɪz//
     
    past simple obsessed
    BrE BrE//əbˈsest//
     
    ; NAmE NAmE//əbˈsest//
     
    past participle obsessed
    BrE BrE//əbˈsest//
     
    ; NAmE NAmE//əbˈsest//
     
    -ing form obsessing
    BrE BrE//əbˈsesɪŋ//
     
    ; NAmE NAmE//əbˈsesɪŋ//
     
    Love
     
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  1. 1[transitive, usually 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. See related entries: Love
  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.
  3. Word Origin late Middle English (in the sense ‘haunt, possess’, referring to an evil spirit): from Latin obsess- ‘besieged’, from the verb obsidere, from ob- ‘opposite’ + sedere ‘sit’. The current sense dates from the late 19th cent.
See the Oxford Advanced American Dictionary entry: obsess