mitching vs skiving

mitching

noun
  • Pilfering; skulking. 

  • Playing truant. 

  • A pretense of poverty. 

skiving

noun
  • A type of machining that skives metal, with various applications including gear cutting. 

  • A piece made in skiving (paring or splitting) leather, especially the part from the inner, or flesh, side. 

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