belt-tightening vs restriction

belt-tightening

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

adj
  • Causing or involving a reduction in expenditure. 

restriction

noun
  • A regulation or limitation that restricts. 

  • The act of restricting, or the state of being restricted. 

  • The mechanism by which a cell degrades foreign DNA material. 

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