cop out vs sidestep

cop out

verb
  • To avoid or shirk, either by failing to perform, or by performing in a grossly insufficient, negligent, or superficial manner. 

  • To plead guilty and ask for mercy. 

sidestep

verb
  • To avoid or dodge. 

  • To step to the side. 

noun
  • A physical motion or metaphorical act to avoid or dodge something. 

  • A step to the side. 

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