keep quiet vs pass on

keep quiet

verb
  • To remain silent. 

  • To refrain from talking about something; to keep a secret. 

pass on

verb
  • To skip or decline. 

  • To convey or communicate. 

  • To go forward. 

  • To die. 

  • To transfer (something) to someone, especially by handing or bequeathing it to the next person in a series. 

How often have the words keep quiet and pass on occurred in a corpus of books? (source: Google Ngram Viewer )