attrit vs mark down

attrit

verb
  • To be reduced in quantity through attrition. 

  • To lose, or to kill, troops by attrition due to sustained firepower. 

  • To engage in attrition; to quit or drop out. 

  • To wear down through attrition, especially mechanical attrition. 

noun
  • One who voluntarily or involuntarily leaves a company; a termed employee. 

mark down

verb
  • To reduce the price of. 

  • To write a memorandum about. 

  • To subtract marks or points from, for an error. 

  • To draw a conclusion about something; to consider something to be a certain way. (Typically used with as.) 

  • To write down. 

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