depart vs drain away

depart

verb
  • To disappear, vanish; to cease to exist. 

  • To leave. 

  • To die. 

  • To go away from; to leave. 

  • To deviate (from), be different (from), fail to conform. 

  • To set out on a journey. 

drain away

verb
  • To diminish over time; to disappear or leak out gradually. 

How often have the words depart and drain away occurred in a corpus of books? (source: Google Ngram Viewer )