hang out to dry vs walk away

hang out to dry

verb
  • To abandon someone who is in need or in danger, especially a colleague or one dependent. 

  • Used other than figuratively or idiomatically: see hang, out, dry. 

walk away

verb
  • To withdraw from a problematic situation. 

  • To free oneself from a debt such as a mortgage by abandoning the collateral to the lender. To make a strategic default. 

  • Used other than figuratively or idiomatically: see walk, away. 

  • To survive a challenging or dangerous situation without harm. 

How often have the words hang out to dry and walk away occurred in a corpus of books? (source: Google Ngram Viewer )