blacken vs shit talk

blacken

verb
  • To defame or sully. 

  • To make dirty. 

  • To cook (meat or fish) by coating with pepper, etc., and quickly searing in a hot pan. 

  • To become black. 

  • To cause to be or become black. 

shit talk

verb
  • Synonym of talk shit 

noun
  • Derogatory speech regarding someone or something. 

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