dig in vs run off

dig in

verb
  • To engage in a burst of hard work. 

  • To cover over by digging. 

  • To adopt a resolute state of mind. 

  • To begin eating. 

  • To dig trenches to resist an enemy attack. 

run off

verb
  • To pour or spill off or over. 

  • To operate by a particular energy or fuel source. 

  • To flee or depart quickly. 

  • to have diarrhea 

  • To make photocopies, or print. 

  • To write something quickly. 

  • To cause to flow away. 

  • To chase someone away. 

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