ripping off vs skimming

ripping off

skimming

noun

  • The sport of skimboarding. 

  • Something skimmed from a surface etc. 

  • A motion or action that skims. 

  • The act of fraudulently copying a magnetic stripe from a magnetic stripe card, such as found on credit cards and bank cards, through the use of a skimmer 

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