countersign vs subscribe

countersign

verb
  • To add a second signature to a document, affirming the validity of the signature of another person. 

  • To sign on the opposite side of (a document). 

noun
  • A second signature added to a document to affirm the validity of the signature of the first person. 

  • The response to a sign or signal. 

subscribe

verb
  • To sign; to mark with one's signature as a token of consent or attestation. 

  • To sign up to have copies of a publication, such as a newspaper or a magazine, delivered for a period of time. 

  • To agree to buy shares in a company. 

  • To pay money to be a member of an organization. 

  • To contribute or promise to contribute money to a common fund. 

  • To indicate interest in the communications made by a person or organization. 

  • To believe or agree with a theory or an idea (used with to). 

  • To pay for the provision of a service, such as Internet access or a cell phone plan. 

  • To register for notifications about an event or similar. 

  • To promise to give, by writing one's name with the amount. 

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