belt-tightening vs exemption

belt-tightening

noun
  • A reduction in expenditure, often as a result of financial restrictions. 

adj
  • Causing or involving a reduction in expenditure. 

exemption

noun
  • A deduction from the normal amount of taxes. 

  • The state of being exempt; immunity. 

  • Freedom from a defect or weakness. 

  • An act of exempting. 

How often have the words belt-tightening and exemption occurred in a corpus of books? (source: Google Ngram Viewer )