push off vs say farewell

push off

verb
  • To go away; to get lost. 

  • To delay, postpone, put off, push back. 

  • to commit a foul by pushing against an opponent to both accelerate more quickly and push the opponent in the opposite direction. 

say farewell

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