punch down vs punch up

punch down

verb
  • To attack or target a group that is weaker or of lower status than oneself. 

punch up

verb
  • To beat (someone) up by punching, to fist-fight. 

  • To attack or target a group of greater power or status than oneself. 

  • To make bolder, zestier, or more exciting. 

  • To switch (a source) into the main transmission. 

How often have the words punch down and punch up occurred in a corpus of books? (source: Google Ngram Viewer )