bump in the road vs one-horse town

bump in the road

noun
  • A very small town. 

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

one-horse town

noun
  • A very small town, especially one of a rural nature and/or offering very few or no attractions. 

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