earn one’s keep vs prop

earn one’s keep

prop

verb
  • To support or shore up something. 

  • To play rugby in the prop position. 

  • To manually start the engine of a propeller-driven aircraft with no electric starter by pulling vigorously on one of the propeller blades using the hands, so that the propeller can catch ignition. 

  • To position the feet of (a person) while sitting, lying down, or reclining so that the knees are elevated at a higher level. 

noun
  • The propeller of an aircraft. 

  • An item placed within an advertisement in order to suggest a style of living etc. 

  • An item placed on a stage or set to create a scene or scenario in which actors perform. 

  • An object placed against or under another, to support it; anything that supports. 

  • Any of the seashells in the game of props. 

  • A proposition, especially on an election-day ballot. 

  • The player on either side of the hooker in a scrum. 

  • propellant (“rocket fuel”) 

How often have the words earn one’s keep and prop occurred in a corpus of books? (source: Google Ngram Viewer )