bump in the road vs encumbrance

bump in the road

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

  • A very small town. 

encumbrance

noun
  • Something that encumbers; a burden that must be carried. 

  • An interest, right, burden, or liability attached to a title of land, such as a lien or mortgage. 

  • One who is dependent on another. 

verb
  • To apply an encumbrance to (property, etc.). 

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