accelerate vs backdate

accelerate

verb
  • To enable a student to finish a course of study in less than normal time. 

  • To become faster; to begin to move more quickly. 

  • Grow; increase. 

  • To quicken the natural or ordinary progression or process of. 

  • To cause to move faster; to quicken the motion of; to add to the speed of. 

  • To cause a change of velocity. 

  • To hasten, as the occurrence of an event. 

adj
  • Accelerated; quickened; hastened; hurried. 

backdate

verb
  • To give or assign a date to a document that is earlier than the current or true date. 

noun
  • An assigned date that is earlier than the current or true date. 

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