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Verb: obsess  ub-ses
  1. Haunt like a ghost; pursue
    "Fear of illness obsesses her";
    - haunt, ghost
     
  2. Be preoccupied with something
    "She is obsessing over her weight"

Derived forms: obsessed, obsesses, obsessing

Type of: preoccupy, sweat [N. Amer, informal], worry

Encyclopedia: Obsess