refrain vs wolf down

refrain

verb
  • To abstain from (food or drink). 

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

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

  • A much repeated comment, complaint, or saying. 

wolf down

verb
  • To consume (food) quickly or greedily, without regard for table manners. 

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