(simile, colloquial) Very cold.

To fail to impress or make an emotional connection with someone.

I am suffering from a cold.

(simile, colloquial, vulgar, humorous) Very cold.

(idiomatic) Synonym of throw cold water on (“to belittle or dismiss”).

(transitive, idiomatic) (of an achievement, emotion, idea, suggestion, etc.) to belittle or dismiss; to cast doubt upon; to debunk.

(obsolete) Dead.

A disease of humans characterized by sudden hemoglobinuria, typically after exposure to cold temperatures.

plural of cold boot attack

(cryptography) A type of sidechannel attack in which somebody with physical access to a computer is able to retrieve encryption keys from a running operating system after a reboot. It relies on the fact that the contents of memory can still be read for a short period after power is cut off.