dotty vs round the bend

dotty

adj

  • Having many dots. 

  • Mildly insane or eccentric; often, senile. 

noun

  • A shotgun. 

round the bend

prep

  • Crazy, mad or insane. 

  • Close to or in close proximity to another location. 

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