keep down vs vomit

keep down

verb
  • To repress. 

  • To cause not to increase or rise. 

  • Not to vomit. 

  • To restrain or control (a sound). 

  • To lie low. To stay concealed by not standing up 

vomit

verb
  • To regurgitate and discharge (something swallowed); to spew. 

  • To regurgitate or eject the contents of the stomach through the mouth; puke. 

  • To eject from any hollow place; to belch forth; to emit. 

noun
  • The act of regurgitating. 

  • The act of vomiting 

  • The regurgitated former contents of a stomach; vomitus. 

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