give off vs refrain

give off

verb
  • To emit; to produce and send forth; to come across in some manner. 

refrain

noun
  • The chorus or burden of a song repeated at the end of each verse or stanza. 

  • A much repeated comment, complaint, or saying. 

verb
  • To stop oneself from some action or interference; to abstain. 

  • To abstain from (food or drink). 

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