conk buster vs cosh

conk buster

cosh

adj
  • cosy; snug 

verb
  • To strike with a weapon of this kind. 

noun
  • A blunt instrument such as a bludgeon or truncheon. 

  • A weapon made of leather-covered metal similar to a blackjack. 

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