overture vs sifflicate

overture

verb
  • To make overtures; to approach with a proposal. 

noun
  • A motion placed before a legislative body, such as the General Assembly of the Church of Scotland. 

  • A musical introduction to a piece of music, or a play. 

  • An approach or proposal made to initiate communication, establish a relationship etc. 

sifflicate

verb
  • To suggest 

  • To criticise 

  • To supplicate, petition, importune, or wheedle 

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