perforate vs unsheathe

perforate

verb
  • To pierce; to penetrate. 

  • To make a line of holes in (a thin material) to allow separation at the line. 

adj
  • perforated 

unsheathe

verb
  • To deprive of a sheath; to draw from the sheath or scabbard, as a sword. 

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