crave vs cross one's fingers

crave

verb
  • To ask for earnestly; to beg; to claim. 

  • To desire strongly, so as to satisfy an appetite; to long or yearn for. 

noun
  • A formal application to a court to make a particular order. 

cross one's fingers

verb
  • when wishing for luck, or 

  • when telling a lie (and attempting to escape the moral and other consequence of that lie). 

  • To put the middle finger across the index finger, especially 

How often have the words crave and cross one's fingers occurred in a corpus of books? (source: Google Ngram Viewer )