mortify vs slow one's roll

mortify

verb
  • To be subdued. 

  • To embarrass, to humiliate. To injure one's dignity. 

  • To grant in mortmain. 

  • To discipline (one's body, appetites etc.) by suppressing desires; to practise abstinence on. 

  • To lose vitality. 

  • To gangrene. 

slow one's roll

verb
  • To calm down. 

How often have the words mortify and slow one's roll occurred in a corpus of books? (source: Google Ngram Viewer )