cosh vs oversleeve

cosh

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

  • A blunt instrument such as a bludgeon or truncheon. 

adj
  • cosy; snug 

verb
  • To strike with a weapon of this kind. 

oversleeve

noun
  • A protective sleeve worn over a normal one 

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