push off vs whistle in the wind

push off

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

  • To go away; to get lost. 

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

whistle in the wind

verb
  • To attempt something that is futile; to say something that is not heeded. 

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