cover ground vs expedite

cover ground

verb
  • To do a certain amount of work; to make progress towards an end. 

expedite

verb
  • To accelerate the progress of. 

  • To perform (a task) fast and efficiently. 

  • To perform the duties of an expediter. 

adj
  • Expeditious; quick; prompt. 

  • Free of impediment; unimpeded. 

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