piss in the wind vs push off

piss in the wind

verb
  • To waste time on a pointless or fruitless task; do something that is ineffective or counterproductive. 

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. 

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