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Synonyms

cosh

1 American  
[kosh] / kɒʃ /

noun

  1. a blackjack; bludgeon.


verb (used with object)

coshes, present (3rd person singular) coshed, past participle, past coshing present participle
  1. to hit on the head with a cosh.

cosh 2 American  
[kosh] / kɒʃ /

noun

Mathematics.
  1. hyperbolic cosine.


cosh 1 British  
/ ˈkɒsˈeɪtʃ, kɒʃ /

noun

  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

"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

cosh 2 British  
/ kɒʃ /

noun

  1. a blunt weapon, often made of hard rubber; bludgeon

  2. an attack with such a weapon

"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

verb

  1. to hit with such a weapon, esp on the head

"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
cosh Scientific  
  1. Abbreviation of hyperbolic cosine


Other Word Forms

Inflected Forms

Participles

Conjugated Forms

Present

Past

Future

Etymology

Origin of cosh1

First recorded in 1865–70; of uncertain origin; perhaps from Romani kosh, koshter “piece of wood,stick,” akin to Sanskrit kāṣṭham

Origin of cosh2

First recorded in 1870–75; cos(ine) + h(yperbolic)

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

Shearer said: "When England were under the cosh, the manager made the right substitutions. The subs came on and they did their job. What an incredible night."

From BBC Jul. 6, 2026

Scotland were leading 1-0 but they were under the cosh against the 83rd best team in the world.

From BBC Jun. 14, 2026

Four-time major champion Sinner was imperious and looked unflustered on the few occasions that the aggressive Shelton put him under the cosh.

From Barron's Jan. 28, 2026

She told the BBC: "She felt under the cosh... No support was offered to her whatsoever."

From BBC Jul. 13, 2023

Sheep's vool shtickin' by der fences efferwhere on der ranch, py cosh!

From The Flying U Ranch by Bower, B. M.

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