bribe vs free lunch

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. 

free lunch

noun
  • Something obtained without any payment, obligation or effort. 

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