pin money vs repayment

pin money

noun
  • An allowance of money given by a man to his wife or to other dependents for their personal, discretionary use. 

repayment

noun
  • The money or other item that is repaid. 

  • The act of revenge, an act of revenge. 

  • The act of repaying. 

How often have the words pin money and repayment occurred in a corpus of books? (source: Google Ngram Viewer )