• synonyms


[kosh]Chiefly British Slang.
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  1. a blackjack; bludgeon.
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verb (used with object)
  1. to hit on the head with a cosh.
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Origin of cosh1

1865–70; perhaps < Romany kosh, koshter stick


noun Mathematics.
  1. hyperbolic cosine.
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Origin of cosh2

First recorded in 1870–75; cos(ine) + h(yperbolic)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for cosh

Historical Examples

  • In his left pocket there was a cosh and in his right a revolver.

    Tartarin de Tarascon

    Alphonse Daudet

  • Copeland, Cosh, and M'Nair, along with their respective wives.

  • Cosh, a neddy, a life-preserver; any short, loaded bludgeon.

    The Slang Dictionary

    John Camden Hotten

  • Coshery, kosh′ėr-i, n. the ancient right of an Irish chief to quarter himself and his retainers on his tenantry—also Cosh′ering.

  • The cosh was a foot length of iron rod, with a knob at one end, and a hook (or a ring) at the other.

    A Child of the Jago

    Arthur Morrison

British Dictionary definitions for cosh


  1. a blunt weapon, often made of hard rubber; bludgeon
  2. an attack with such a weapon
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verb (tr)
  1. to hit with such a weapon, esp on the head
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Word Origin

C19: from Romany kosh, from koshter skewer, stick


  1. hyperbolic cosine; a hyperbolic function, cosh z = 1/2 (e z + e –z), related to cosine by the expression cosh i z = cos z, where i = √–1
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Word Origin

C19: from cos (ine) + h (yperbolic)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for cosh


"stout stick," 1869, of unknown origin.

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Online Etymology Dictionary, © 2010 Douglas Harper

cosh in Science


  1. Abbreviation of hyperbolic cosine
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.