- to hit on the head with a cosh.
- hyperbolic cosine.
- a blunt weapon, often made of hard rubber; bludgeon
- an attack with such a weapon
- to hit with such a weapon, esp on the head
- 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
