burn out vs overburden

burn out

verb
  • To tire due to overwork; to overwork to their limit. 

  • To end one's shift at a job. 

  • To have one's tires skid against the ground; to peel off, peel out. 

  • To destroy by fire. 

  • To cause (someone) to tire due to overwork; to cause (someone) to overwork to one's limit. 

  • To make (someone) unavailable for work involving exposure to ionizing radiation by employing (the person) in such work until the person's accumulated exposure reaches the maximum permitted for an administrative period, typically a year. 

  • To become extinguished due to lack of fuel. 

  • To become nonfunctional (especially of lightbulbs or similar light-producing devices). 

noun
  • (of a person) The condition of tiredness due to overwork. 

overburden

verb
  • To overload or overtax. 

noun
  • A sterile stratum that lies above the stratum being investigated 

  • The rock and subsoil that lies above a mineral deposit such as a coal seam. 

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