repress vs set in motion

repress

verb
  • To forcefully prevent an upheaval from developing further. 

  • To check; to keep back. 

  • To press again. 

noun
  • A record pressed again; a repressing. 

set in motion

verb
  • To trigger movement or progress; to get going. 

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