belt-tightening vs plummet

belt-tightening

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

adj
  • Causing or involving a reduction in expenditure. 

plummet

noun
  • A decline; a fall; a drop. 

  • A violent or dramatic fall. 

verb
  • To drop swiftly, in a direct manner; to fall quickly. 

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