obsess obsess /əbˈsɛs/

verb

1. () Haunt like a ghost; pursue  ( ghost , obsess , haunt )
   haunt like a ghost; pursue
    Fear of illness haunts her
   Fear of illness haunts her
   
2. Be preoccupied with something  ( obsess )
   be preoccupied with something
    She is obsessing over her weight
   She is obsessing over her weight