belt-tightening vs deferment

belt-tightening

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

adj
  • Causing or involving a reduction in expenditure. 

deferment

noun
  • An act or instance of deferring or putting off. 

  • Officially sanctioned postponement of compulsory military service. 

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