There are 2 definitions of cosh in English:

cosh1

Syllabification: cosh
Pronunciation: /käSH
 
/
British informal

noun

A thick heavy stick or bar used as a weapon; a bludgeon.
More example sentences
  • It houses thousands of weapons, including guns and ammunition, knives, knuckledusters, coshes, crossbows and swords.
  • Some were armed with bottles and others brandished weapons including coshes or iron bars, a screwdriver and a knife.
  • When the lockers were later searched coshes, knives, bayonets, and swords were found.

verb

[with object] Back to top  
Hit (someone) on the head with a cosh.
More example sentences
  • Fourteen years after this was made, the idea of robberies from trains, and indeed coshing drivers - coolly omitted from the professor's sophistical account of what harm his thieves have really done - lost a smidgen of its innocence.
  • The columnist coshed me on the back of the head and, while I was out, dumped me in the uncharted territory of his foreign policy mistakes.
  • Each member brought a particular skill to the gang, which successfully robbed the night mail train to London, causing serious head injuries when they coshed the train driver, who never fully recovered.

Origin

mid 19th century: of unknown origin.

Definition of cosh in:

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Word of the day anomalous
Pronunciation: əˈnɒm(ə)ləs
adjective
deviating from what is standard, normal, or expected

There are 2 definitions of cosh in English:

cosh2

Syllabification: cosh
Pronunciation: /käSH
 
/

abbreviation

Mathematics
Hyperbolic cosine.

Origin

from cos2 + -h for hyperbolic. Compare with coth.

Definition of cosh in: