involve vs refuse

involve

verb
  • To cause or engage (someone or something) to participate or to become connected or implicated. 

  • To take in; to gather in; to mingle, blend or merge. 

  • To comprise or include; to have as a related part. 

  • To complicate or make intricate. 

  • To envelop, enfold, entangle. 

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 involve and refuse occurred in a corpus of books? (source: Google Ngram Viewer )