backslide vs wallow in the mire

backslide

verb
  • To shirk responsibility; to renege on one's obligations or commitments. 

  • To revert back into a life of sin after being saved. 

  • To regress; to slip backwards or revert to a previous, worse state. 

noun
  • A backward regression; a reverting back to a worse state. 

  • A dance move in which the feet are alternately slid back and the heels lifted, giving the illusion of walking forwards while actually moving backwards. 

wallow in the mire

verb
  • To revel in baseness or scandal. 

  • Used other than figuratively or idiomatically: see wallow, mire. 

How often have the words backslide and wallow in the mire occurred in a corpus of books? (source: Google Ngram Viewer )