cop out vs directness

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. 

directness

noun
  • The state or quality of being direct. 

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