down-at-heel vs squalid

down-at-heel

squalid

adj

  • Extremely dirty and unpleasant. 

  • Showing a contemptible lack of moral standards. 

noun

  • Any member of the family Squalidae of dogfish sharks. 

How often have the words down-at-heel and squalid occurred in a corpus of books? (source: Google Ngram Viewer )