get behind vs prevent

get behind

verb
  • Used other than figuratively or idiomatically: see get, behind. 

  • To support, to cheer on. 

  • To have a trip or any pleasurable experience with drugs. 

  • To come to believe something; to change one's mind into a new position. 

  • To appreciate, to enjoy. 

prevent

verb
  • To stop (an outcome); to keep from (doing something). 

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