devolve vs sign over

devolve

verb
  • To delegate (a responsibility, duty, etc.) on or upon someone. 

  • To be inherited by someone else; to pass down upon the next person in a succession, especially through failure or loss of an earlier holder. 

  • To degenerate; to break down. 

  • To fall as a duty or responsibility on or upon someone. 

sign over

verb
  • To transfer (property or rights) to somebody else by signing a document. 

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