down at heel vs downgone

down at heel

adj
  • Shabbily dressed, slovenly; impoverished; shabby, dilapidated. 

  • In poor condition, especially due to having worn heels; worn-out, shabby. 

downgone

adj
  • Poor-looking; shabby 

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