locomotion vs to and fro

locomotion

noun
  • A dance, originally popular in the 1960s, in which the arms are used to mimic the motion of the connecting rods of a steam locomotive. 

  • The ability to move from place to place, or the act of doing so. 

  • Self-powered motion by which a whole organism changes its location through walking, running, jumping, crawling, swimming, brachiating or flying. 

to and fro

adv
  • Back and forth; with a reciprocating motion. 

verb
  • To go back and forth; to alternate. 

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