mix it up vs sass

mix it up

verb
  • To engage with people, relate to people. 

  • To create one or more variations of the usual way in which something is done. 

  • To compete vigorously, to quarrel, or to fight physically. 

sass

verb
  • To talk, to talk back. 

  • To speak insolently to. 

noun
  • Backtalk, cheek, sarcasm. 

How often have the words mix it up and sass occurred in a corpus of books? (source: Google Ngram Viewer )