belt-tightening vs depreciation

belt-tightening

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

adj
  • Causing or involving a reduction in expenditure. 

depreciation

noun
  • The decline in value of assets. 

  • The state of being depreciated; disparagement. 

  • The measurement of the decline in value of assets. Not to be confused with impairment, which is the measurement of the unplanned, extraordinary decline in value of assets. 

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