put out to grass vs retired

put out to grass

verb
  • Synonym of put out to pasture 

retired

adj
  • Secluded from society (of a lifestyle, activity etc.); private, quiet. 

  • Of a place: far from civilisation, not able to be easily seen or accessed; secluded. 

  • Having left employment, especially on reaching pensionable age. 

  • No longer in use or production. 

How often have the words put out to grass and retired occurred in a corpus of books? (source: Google Ngram Viewer )