/ kɒʃ; NAmE kɑːʃ/ noun , verb
■ noun
( especially BrE ) a short thick heavy stick, for example a piece of metal or solid rubber, that is used as a weapon
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IDIOMS
- under the cosh
■ verb
[ vn ] ( especially BrE ) to hit sb hard with a cosh or sth similar
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WORD ORIGIN
mid 19th cent.: of unknown origin.