clawback vs white knight

clawback

noun
  • A rule that permits a party to take back evidentiary materials that were mistakenly turned over to the other party but to which the other party would not have been entitled. 

  • Any recovery of a performance-related payment based on discovery that the performance was not genuine. 

  • Money that a party is entitled to keep under one tax provision but is taken by another tax provision. 

white knight

verb
  • To unnecessarily defend someone, especially in an attempt to gain favour. 

noun
  • An individual or corporation that intends to acquire another company in order to avert a hostile takeover. 

  • Someone who unnecessarily defends someone else. 

  • A man who defends a woman in debate etc. in an attempt to gain her favour. 

  • A mushroom of species Tricholoma album. 

  • A hero, savior, or righteous individual. 

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