batty vs round the bend

batty

adj

  • Mad, crazy, silly. 

noun

  • The buttocks or anus. 

  • A homosexual man. 

round the bend

prep

  • Crazy, mad or insane. 

  • Close to or in close proximity to another location. 

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