cop out vs ship out

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. 

ship out

verb
  • To get rid of, expel, or discard. 

  • To depart, especially for a sea voyage or military assignment. 

  • To leave, get out, or resign. 

  • To send, especially by means of a transport vehicle. 

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