belt-tightening vs vitiation

belt-tightening

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

adj
  • Causing or involving a reduction in expenditure. 

vitiation

noun
  • a reduction in the value, or an impairment in the quality of something 

  • moral corruption 

  • an abolition or abrogation 

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