hit sb with a cosh
cosh 指皮革包裹金属的短棍，属钝器；with 引出所使用的凶器。
The robber hit the guard with a cosh.
劫匪用短棍打了保安。
双曲余弦；一种外包皮革的金属武器,类似短棍。；钝器,如大头棒或警棍；大头棍；内装金属的橡皮棒
A short, heavy blunt weapon, such as a leather-covered metal club or a truncheon.
一种外包皮革的金属武器,类似短棍。
A weapon made of leather-covered metal similar to a blackjack.
双曲余弦
hyperbolic cosine
钝器,如大头棒或警棍
A blunt instrument such as a bludgeon or truncheon.
The thief pulled out a cosh and threatened the shopkeeper.
小偷抽出一根短棍威胁店主。
用法提示：名词 cosh 指一种短棍武器。
He kept a cosh under the car seat for self-defense.
他在车座下放了一根短棍用于自卫。
用法提示：名词 cosh 指用于防身的短棍。
The police found a cosh hidden in the suspect's bag.
警方在嫌疑人的包里发现了一根短棍。
用法提示：名词 cosh 指作为证据的短棍武器。
cosh 指皮革包裹金属的短棍，属钝器；with 引出所使用的凶器。
The robber hit the guard with a cosh.
劫匪用短棍打了保安。
cosh 为可数名词，复数形式是 coshes。
The two men were armed with coshes.
那两名男子持有短棍。
数学语境中 cosh 直接放在变量前，表示双曲余弦函数。
In this formula, cosh x denotes the hyperbolic cosine of x.
在这个公式中，cosh x 表示 x 的双曲余弦。
grammar · medium
易错句子The robber pulled out cosh and hit the guard.
正确表达The robber pulled out a cosh and hit the guard.
cosh 是可数名词的单数形式，前面必须有冠词或限定词；汉语名词前常可不用冠词，但英语单数可数名词不能单独使用，所以要加 a。
grammar · medium
易错句子The security guards were carrying two cosh.
正确表达The security guards were carrying two coshes.
cosh 是可数名词，复数形式为 coshes（以 -sh 结尾加 -es）；汉语名词不随数词变化，但英语在 two 等数词后必须用复数形式。
cosh 泛指可藏匿、皮革包裹金属的短棍状钝器，常见于袭击或犯罪语境；truncheon 特指警察的制式警棍，属正式且偏英式的用法，一般不用于描述罪犯的武器。
cosh 强调皮革包裹金属、便于隐蔽携带的短棍；bludgeon 指粗重的大头棒，强调重量和殴打致伤，不强调隐蔽性。
cosh 与 blackjack 都指皮革包裹的金属钝器；blackjack 通常指更短小、可藏于袖中或折叠的美式武器，cosh 则是英式说法，体积常稍长。
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