knock it off vs prevent

knock it off

verb
  • To cease doing something, particulary annoying or unpleasant; to desist. 

intj
  • Cease doing something, particularly annoying or unpleasant; desist. 

prevent

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

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