meatgrinder vs pencil sharpener

meatgrinder

noun
  • A device for cutting meat into very small pieces. 

  • An activity with a high casualty or attrition rate, such as a military battle or an occupational or athletic activity. 

  • The mountainous second day of the race was a real meatgrinder, with 20% of racers dropping out. 

  • A process that is likely to be injurious in a non-physical way. 

pencil sharpener

noun
  • A device used to sharpen pencils by shaving the wood at one end. 

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