dirk vs singlestick

dirk

noun
  • A long Scottish dagger with a straight blade. 

verb
  • To stab with a dirk. 

singlestick

noun
  • A one-handed wooden stick used for fencing in place of a sword. 

  • A martial art, sport or exercise using a cudgel or backsword. 

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