cop out vs lead on a merry chase

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. 

lead on a merry chase

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