burn out vs overstrain

burn out

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

  • 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. 

overstrain

verb
  • To subject to an excessive demand on strength, resources, abilities, or the imagination. 

noun
  • excessive strain 

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