bird dog vs sitter

bird dog

noun
  • A person who seeks out real estate investment opportunities in exchange for a fee. 

  • A dog, especially a pointer, used in shooting to retrieve the dead birds. 

  • A tout. 

  • A person who tries to steal someone else's romantic partner 

  • A radar detector (for detecting police speed traps). 

  • A hyperextension exercise performed lying on the knees, with one arm and the opposite leg lifted. 

verb
  • A multiservice tactical brevity code requesting configuration of sensors. 

  • To seek out. 

  • To watch closely. 

sitter

noun
  • One employed to watch or tend something; a babysitter, housesitter, petsitter, etc. 

  • A very easy scoring chance. 

  • A broody hen. 

  • A participant in a séance. 

  • Someone who sits, e.g. for a portrait. 

How often have the words bird dog and sitter occurred in a corpus of books? (source: Google Ngram Viewer )