lose one's head vs off with someone's head

lose one's head

verb
  • To suffer decapitation. 

  • To be killed, usually in a gruesome manner. 

  • To be dismissed from a job. 

  • To behave irrationally or to lose one's self-control, especially in a distressing situation or as a result of falling in love. 

off with someone's head

phrase
  • Used to express a desire to kill the person in question. 

How often have the words lose one's head and off with someone's head occurred in a corpus of books? (source: Google Ngram Viewer )