cosh

1
[ kosh ]
/ kɒʃ /
Chiefly British Slang.

noun

a blackjack; bludgeon.

verb (used with object)

to hit on the head with a cosh.

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.