cosh
noun /kɒʃ/
  /kɑːʃ/
(British English)Idioms - a short thick heavy stick, for example a piece of metal or solid rubber, that is used as a weaponWord Originmid 19th cent.: of unknown origin.
 
Idioms 
under the cosh 
- (British English, informal) experiencing a lot of pressure
- Our side was under the cosh for most of the second half.