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definitions

cosh

1
[ kosh ]
/ kɒʃ /
Chiefly British Slang.
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noun

a blackjack; bludgeon.

verb (used with object)

to hit on the head with a cosh.

RELATED WORDS

business, staff, truncheon, nightstick, bash, clobber, pummel, whack, bludgeon, sap, cudgel, works, baton, mace, blackjack, hammer, quarterstaff, hickory, mallet, shillelagh

Nearby words

cosell, howard, cosenza, coset, cosgrave, cosgrave, william thomas, cosh, cosher, coshocton, cosign, cosignatory, cosigner

Origin of cosh

1
1865–70; perhaps < Romany kosh, koshter stick

Definition for cosh (2 of 2)

cosh

2
[ kosh ]
/ kɒʃ /

noun Mathematics.

hyperbolic cosine.

Origin of cosh

2
First recorded in 1870–75; cos(ine) + h(yperbolic)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for cosh

British Dictionary definitions for cosh (1 of 2)

cosh

1
/ (kɒʃ) British /

noun

a blunt weapon, often made of hard rubber; bludgeon
an attack with such a weapon

verb (tr)

to hit with such a weapon, esp on the head

Word Origin for cosh

C19: from Romany kosh, from koshter skewer, stick

British Dictionary definitions for cosh (2 of 2)

cosh

2
/ (kɒʃ, ˈkɒsˈeɪtʃ) /

noun

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

Word Origin for cosh

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

cosh

n.

"stout stick," 1869, of unknown origin.

Online Etymology Dictionary, © 2010 Douglas Harper

Science definitions for cosh

cosh

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