joust vs ply weapons

joust

noun
  • A tilting match: a mock combat between two mounted knights or men-at-arms using lances in the lists or enclosed field. 

verb
  • To touch penises while engaging in a sex act, especially oral sex. 

  • To engage in verbal sparring over an important issue. (used of two people, both of whom participate more or less equally) 

  • To engage in mock combat on horseback, as two knights in the lists; to tilt. 

ply weapons

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