backset vs cropper

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. 

cropper

noun
  • A fall, a tumble; a decided failure. 

  • A person who nurtures and gathers a crop. 

  • A variety of plant producing a good harvest. 

  • A machine for cropping, as for shearing off bolts or rod iron, or for facing cloth. 

  • A breed of domestic pigeon with large crop. 

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