pound sand vs push off

pound sand

verb
  • To go away; get lost; go to hell. 

  • To engage in a futile activity. 

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. 

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