bald vs person-to-person

bald

adj
  • Of tyres: whose surface is worn away. 

  • Having areas (of fur or plumage) that are coloured white, especially on the head. 

  • Unembellished. 

  • Having no hair, fur or feathers. 

  • Without evidence or support being provided. 

  • Having no hair on the head, or having a large area of bare scalp on top of the head although hair may still grow on the sides and back of the head. 

  • Denuded of any covering. 

noun
  • A mountain summit or crest that lacks forest growth despite a warm climate conducive to such, as is found in many places in the Southern Appalachian Mountains. 

verb
  • To become bald. 

person-to-person

adj
  • Such that the caller is only connected and charged if the person he specified is available to speak. 

  • Such that the lender and borrower are individuals rather than companies. 

How often have the words bald and person-to-person occurred in a corpus of books? (source: Google Ngram Viewer )