dak vs special delivery

dak

noun
  • A post system by means of transport relays of horses stationed at intervals along a route or network, carrying mail and passengers. 

  • A dak bungalow. 

verb
  • To suddenly pull down someone's pants as a prank; to pants. 

special delivery

noun
  • A kind of postal service in which, for an extra fee, letters and packages are delivered in a highly expedited manner by a special courier. 

  • A particular posted letter or package which is delivered in this manner; a particular act of conveying such letters or packages to one or more recipients. 

  • Something—whether desirable or undesirable—which is intentionally given to a specific individual or which an individual receives rapidly and unexpectedly; the personalized, direct quality of the transmission of such an item. 

How often have the words dak and special delivery occurred in a corpus of books? (source: Google Ngram Viewer )