English to English

verb (v)

• haunt like a ghost; pursue(verb.emotion)

  Synonym:
  ghost, haunt
  

  source: wordnet30
• be preoccupied with something(verb.emotion)

  Example:
  She is obsessing over her weight.
  

  source: wordnet30
• To besiege; to beset.(verb)

  source: webster1913