cat's-foot vs rubber stamp

cat's-foot

noun
  • Synonym of cat's-paw: a foot of a cat; (figurative, obsolete) a person used unwittingly or through trickery by another. 

  • Synonym of mountain cudweed (Antennaria dioica). 

  • Synonym of ground ivy (Glechoma hederacea). 

rubber stamp

noun
  • A piece of rubber or similar material with a design or text carved or molded for the purpose of transferring ink or dye to imprint that design on another object. 

  • A person or organisation that approves, routinely or as a formality, matters decided by some other person or organisation. 

adj
  • Of a person, organisation, or process, making decisions or approving matters routinely or without real power. 

verb
  • To process, approve or decide matters routinely rather than through careful consideration. 

How often have the words cat's-foot and rubber stamp occurred in a corpus of books? (source: Google Ngram Viewer )