mouth off vs wisecrack

mouth off

verb
  • To complain or otherwise express oneself in a loud, immoderate manner. 

  • To talk impudently, especially to one's superior. 

wisecrack

verb
  • To make a sarcastic, flippant, or sardonic comment. 

noun
  • A witty or sarcastic comment or quip. 

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