crankshaft vs pedal

crankshaft

noun
  • A rotating shaft that drives (or is driven by) a crank. 

verb
  • To deform in such a manner that part of the rod or bolt is displaced sideways, offset from the longitudinal axis of the part, but remains parallel with the part's main longitudinal axis, with the final shape somewhat resembling a crankshaft. 

pedal

noun
  • A lever operated by one's foot that is used to control or power a machine or mechanism, such as a bicycle or piano 

  • The ranks of pipes played from the pedal-board of an organ. 

  • an orthopedic structure or a footlike part. 

  • An effects unit, especially one designed to be activated by being stepped on. 

  • A stirrup. 

verb
  • To operate a pedal attached to a wheel in a continuous circular motion. 

  • To operate a bicycle. 

adj
  • Of or relating to the foot. 

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