push back vs refuse

push back

verb
  • To postpone. 

  • To refute or argue against a position or an accusation; to express one's own view on a situation. 

  • To summarily expel asylum seekers, especially in violation of the principle of non-refoulement. 

  • Used other than figuratively or idiomatically: see push, back. 

refuse

verb
  • To decline (a request or demand). 

  • To decline a request or demand, forbear; to withhold permission. 

  • To melt again. 

  • To throw back, or cause to keep back (as the centre, a wing, or a flank), out of the regular alignment when troops are about to engage the enemy. 

noun
  • Collectively, items or material that have been discarded; rubbish, garbage. 

adj
  • Discarded, rejected. 

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