bird dog vs check out

bird dog

verb
  • To seek out. 

  • A multiservice tactical brevity code requesting configuration of sensors. 

  • To watch closely. 

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

  • A tout. 

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

  • 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. 

check out

verb
  • To examine, inspect, look at closely, ogle; to investigate; to gather information so as to make a decision. 

  • To die. 

  • To obtain (source code or other material) from a repository so that one can modify it and later check it back in. 

  • To prove (after an investigation) to be the case, or to be in order. 

  • To visit the oche for the last time and clear one's remaining points to win the game. 

  • To record (someone) as leaving the premises or as taking something therefrom, as from a library or shop. 

  • To become uninterested in an activity and cease to participate in more than a perfunctory manner; to become uncooperative. 

  • To withdraw (an item), as from a library, and have the withdrawal recorded. 

  • To leave in a hurry. 

  • To confirm and pay for goods and services at a facility (e.g.: supermarket, online store, hotel) when leaving. 

  • To become catatonic or otherwise nonresponsive. 

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