come back vs cop out

come back

verb
  • To return to one's possession, especially of memories. 

  • To retort. 

  • To return to a former state, usually a desirable one; to become fashionable once more. 

  • To return to a place. 

cop out

verb
  • To plead guilty and ask for mercy. 

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

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