[1] : The Collaborative International Dictionary of English v.0.48

cosh \cosh\ n.
   a piece of leather-covered metal with a flexible handle; used
   for hitting people. slang

   syn: blackjack, sap.
        wordnet 1.5

[2] : The Collaborative International Dictionary of English v.0.48

cosh \cosh\ v. t.
   to hit someone with a cosh or similar bludgeon, usually on
   the head. slang
   wordnet 1.5 + pjc

[3] : The Collaborative International Dictionary of English v.0.48

cosh \cosh\ v.
   1. .
      wordnet 1.5

[4] : WordNet (r) 2.0

cosh
     n : a piece of metal covered by leather with a flexible handle;
         used for hitting people syn: blackjack, sap
     v : hit with a cosh, usually on the head
see also:
blackjack sap 

Cosh >> C Words
Cosh, definition of term: Cosh
cosh_pag1.html