bowstring vs carry out a sentence of death on

bowstring

verb

  • To strangle with a bowstring. 

noun

  • The string of an archer's bow. 

  • The string of an archer's bow, as used by the Turks for strangling offenders. 

carry out a sentence of death on

How often have the words bowstring and carry out a sentence of death on occurred in a corpus of books? (source: Google Ngram Viewer )