shin vs trouser leg

shin

noun
  • The front part of the leg below the knee; the front edge of the shin bone: Shinbone on Wikipedia.Wikipedia 

  • A fishplate for a railway 

  • The twenty-first letter of many Semitic alphabets/abjads (Phoenician, Aramaic, Hebrew, Syriac, Arabic and others): Shin (letter) on Wikipedia.Wikipedia 

verb
  • To strike with the shin. 

  • To climb a mast, tree, rope, or the like, by embracing it alternately with the arms and legs, without help of steps, spurs, or the like. 

  • To run about borrowing money hastily and temporarily, as when trying to make a payment. 

trouser leg

noun
  • Either of the legs of a pair of trousers 

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