(slang) A small heavy object used to give additional force to a punch or other blow of the hand.

(slang) To hit someone with a cold cock. / (slang) To hit someone with a club, bottle, or any object that gives additional force to the blow. / (slang) To knock someone unconscious.

(Australia, New Zealand) potato chips, crisps.

(metallurgy) Any of several plastic deformations of metal (or other material) at relatively low temperatures.

Completely cold. / Without emotion.

In a cold-blooded manner.

In a cold-hearted manner.

the state of being cold-hearted

(idiomatic) A deliberate act of disrespect; a slight or snub

(idiomatic) To deliberately slight or snub someone.