cop out vs pussyfoot

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. 

pussyfoot

verb
  • To act timidly or cautiously. 

  • To use euphemistic language or circumlocution. 

  • To move silently, stealthily, or furtively. 

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