stumble vs unhorse

stumble

verb
  • To strike or happen (upon a person or thing) without design; to fall or light by chance; with on, upon, or against. 

  • To cause to stumble or trip. 

  • To trip or fall; to walk clumsily. 

  • To make a mistake or have trouble. 

  • To mislead; to confound; to cause to err or to fall. 

noun
  • An error or blunder. 

  • A fall, trip or substantial misstep. 

  • A clumsy walk. 

unhorse

verb
  • To disrupt or unseat; to remove from a position. 

  • To forcibly remove from a horse. 

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