dig vs in-joke

dig

noun
  • A cutting, sarcastic remark. 

  • Digoxin. 

  • A defensive pass of the ball that has been attacked by the opposing team. 

  • An archeological or paleontological investigation, or the site where such an investigation is taking place. 

  • A rare or interesting vinyl record bought second-hand. 

  • A thrust; a poke. 

  • The occupation of digging for gold. 

  • An innings. 

verb
  • To move hard-packed earth out of the way, especially downward to make a hole with a shovel. Or to drill, or the like, through rocks, roads, or the like. More generally, to make any similar hole by moving material out of the way. 

  • To get by digging; to take from the ground; often with up. 

  • To take ore from its bed, in distinction from making excavations in search of ore. 

  • To defend against an attack hit by the opposing team by successfully passing the ball 

  • To investigate, to research, often followed by out or up. 

  • To thrust; to poke. 

in-joke

noun
  • Synonym of inside joke (“a joke that is understood or meant to be understood only by certain people who are aware of the details”) 

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