downer vs refresher

downer

noun
  • A livestock animal that has collapsed. 

  • A negative drug trip. 

  • A form of industrial action in which workers down tools and refuse to work. 

  • Something or someone disagreeable, dispiriting or depressing; a killjoy. 

  • A drug that has depressant qualities. 

refresher

noun
  • An equity grant given by a company to an existing employee, as opposed to an initial grant given to new employees. 

  • A review to refresh or renew knowledge. 

  • A fee paid to counsel to continue with a case, especially one that was adjourned. 

  • Something that refreshes. 

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