ax to grind vs fetish

ax to grind

noun
  • A proposition or point of view to advocate, especially motivated by self-interest. 

  • A grudge or grievance, with implications of confrontation. 

fetish

noun
  • An irrational, or abnormal fixation or preoccupation; an obsession. 

  • Sexual attraction to or arousal at something abnormally sexual or nonsexual, such as an object or a nonsexual part of the body. 

  • Something which is believed to possess, contain, or cause spiritual or magical powers; an amulet or a talisman. 

How often have the words ax to grind and fetish occurred in a corpus of books? (source: Google Ngram Viewer )