horsepower vs sinew

horsepower

noun
  • Strength. 

  • Power derived from the motion of a horse. 

  • A nonmetric unit of power (symbol hp) with various definitions, for different applications. The most common of them is probably the mechanical horsepower, approximately equal to 745.7 watts. 

  • A metric unit (symbol often PS from the German abbreviation), approximately equal to 735.5 watts. 

sinew

noun
  • That which gives strength or in which strength consists; a supporting factor or member; mainstay. 

  • A cord or tendon of the body. 

  • A cord or string, particularly (music) as of a musical instrument. 

  • Muscular power, muscle; nerve, nervous energy; vigor, vigorous strength. 

verb
  • To knit together or make strong with, or as if with, sinews. 

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