cosh1Pronunciation: /kɒʃ/ British informalTranslate cosh | into French | into German | into Italian Definition of cosh noun a thick, heavy stick or bar used as a weapon: the defendants deny having a self-loading pistol and a telescopic cosh verb [with object] hit (someone) on the head with a cosh: the other coshed him and he fell unconsciousPhrases under the cosh under pressure; in a difficult situation:car dealers are under the cosh right nowOrigin: mid 19th century: of unknown origincosh in other Oxford dictionaries Definition of cosh in the US English dictionary