defer vs take a rain check

defer

verb
  • To delay or postpone 

  • To submit to the opinion or desire of others in respect to their judgment or authority. 

  • To render, to offer. 

  • to postpone induction into military service. 

  • After winning the opening coin toss, to postpone until the start of the second half a team's choice of whether to kick off or receive (and to allow the opposing team to make this choice at the start of the first half). 

  • To delay, to wait. 

take a rain check

verb
  • In social interactions, to request a deferral of an invitation. To "take a rain check" is a polite way to turn down an engagement, usually with the implication that one is simply postponing it and another time might be acceptable. 

  • To request or accept a rain check (an agreement from a merchant to honor a special offer, temporarily unavailable, after the expiration date). 

How often have the words defer and take a rain check occurred in a corpus of books? (source: Google Ngram Viewer )