garrote vs polish off

garrote

noun
  • an iron collar formerly used in Spain to execute people by strangulation 

  • something, especially a cord or wire, used for strangulation 

verb
  • to execute by strangulation 

  • to kill using a garrote 

polish off

verb
  • To finish completely, especially a food (polish the plate with one's tongue) or liquor. 

  • To remove by polishing (rubbing with a fine abrasive). 

How often have the words garrote and polish off occurred in a corpus of books? (source: Google Ngram Viewer )