relinquish vs sign over

relinquish

verb
  • To metaphorically surrender, yield control or possession. 

  • To give up, abandon or retire from something. To trade away. 

  • To let go (free, away), physically release. 

  • To accept to give up, withdraw etc. 

sign over

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

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