accept vs countersign

accept

verb
  • To receive or admit to; to agree to; to assent to; to submit to. 

  • To admit to a place or a group. 

  • To acknowledge patiently without opposition or resistance. 

  • To endure patiently. 

  • To regard as proper, usual, true, or to believe in. 

  • To receive, especially with a consent, with favour, or with approval. 

  • To agree to pay. 

  • To receive officially. 

  • To receive as adequate or satisfactory. 

  • To receive something willingly. 

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. 

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