black as Newgate's knocker vs swarthy

black as Newgate's knocker

adj

  • Completely black in colour. 

swarthy

adj

  • Dark-skinned; Black. 

  • Tawny, dusky, dark. 

  • Weathered, rough. 

  • A dark grey color. 

  • Evil, malicious. 

  • Darker-skinned than white, but lighter-skinned than tawny; tan. 

noun

  • A swarthy person. 

How often have the words black as Newgate's knocker and swarthy occurred in a corpus of books? (source: Google Ngram Viewer )