bribe vs slush fund

bribe

noun
  • Something (usually money) given in exchange for influence or as an inducement to breaking the law. 

  • That which seduces; seduction; allurement. 

verb
  • To give a bribe to; specifically, to ask a person to do something against his/her original will, in exchange for some type of reward or relief from potential trouble. 

  • To gain by a bribe; to induce as by a bribe. 

slush fund

noun
  • Money that has not been hypothecated or dedicated to a particular purpose, or which is used for a different purpose than originally intended. 

  • Money stored for illegal or dishonest purposes. 

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