kerb vs roadblock

kerb

noun
  • The raised edge between the pavement and the roadway, typically made of concrete though originally consisting of a line of kerbstones. 

  • A stone ring built to enclose and sometimes revet the cairn or barrow built over a chamber tomb. 

verb
  • To damage vehicle wheels or tyres by running into or over a pavement kerb. 

  • To take a dog to the kerb for the purpose of evacuating. 

roadblock

noun
  • Something that blocks or obstructs a road. 

  • An obstacle or impediment. 

verb
  • To prevent, hinder. 

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