costing an arm and a leg vs lavish

costing an arm and a leg

lavish

adj
  • Superabundant; excessive. 

  • Expending or bestowing profusely; profuse; prodigal. 

verb
  • To give out extremely generously; to squander. 

  • To give out to (somebody) extremely generously. 

How often have the words costing an arm and a leg and lavish occurred in a corpus of books? (source: Google Ngram Viewer )