appease vs pour oil on troubled waters

appease

verb
  • To make quiet; to calm; to reduce to a state of peace; to dispel (anger or hatred). 

  • To come to terms with; to adapt to the demands of. 

pour oil on troubled waters

verb
  • To calm, appease or quieten a person or situation. 

How often have the words appease and pour oil on troubled waters occurred in a corpus of books? (source: Google Ngram Viewer )