cosh vs life preserver

cosh

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

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

verb
  • To strike with a weapon of this kind. 

adj
  • cosy; snug 

life preserver

noun
  • A buoyant ring or vest intended to keep a person afloat. 

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