litigate vs sifflicate

litigate

verb
  • To dispute; to fight over. 

  • To go to law; to carry on a lawsuit. 

  • To contest in law. 

sifflicate

verb
  • To criticise 

  • To suggest 

  • To supplicate, petition, importune, or wheedle 

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