bump in the road vs jerk-water

bump in the road

noun
  • A very small town. 

  • A setback or obstacle, especially one which is relatively minor. 

jerk-water

adj
  • Railroads with low traffic. 

  • Of an inhabited place, small, isolated, backward. 

noun
  • A branch line train, using light equipment 

How often have the words bump in the road and jerk-water occurred in a corpus of books? (source: Google Ngram Viewer )