blank check vs power of attorney

blank check

noun
  • A grant of complete authority to spend an unlimited amount of money, or to take other actions without restraint. 

  • A signed check of the type used to draw money from a bank account, containing no information as to the amount to be paid with it, so that any amount can be filled in. 

power of attorney

noun
  • The legal authorisation of one person to act as the agent of another. 

  • A legal document allowing one person to act as the agent of another. 

How often have the words blank check and power of attorney occurred in a corpus of books? (source: Google Ngram Viewer )