shell out vs splurge

shell out

verb
  • To pay money, to disburse; especially, to pay a great deal of money. 

  • To use a program's "shell escape" function to execute an unrelated command or to invoke a subsidiary, interactive shell. 

splurge

verb
  • To spend lavishly or extravagantly, especially money. 

  • To (cause to) gush; to flow or move in a rush. 

  • To produce an extravagant or ostentatious display. 

noun
  • An extravagant indulgence; a spending spree. 

  • An extravagant or ostentatious display. 

How often have the words shell out and splurge occurred in a corpus of books? (source: Google Ngram Viewer )