backset vs humbling

backset

noun
  • A check; a relapse; a discouragement; a setback. 

  • Whatever is thrown back in its course, such as water. 

verb
  • To plow again in the fall; said of prairie land broken up in the spring. 

humbling

noun
  • An event which causes humbleness; a set-down. 

adj
  • Of higher rank, status, quality, strength, etc.; inducing a feeling of inferiority. 

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