cold as a mackerel
Very coldVery cold (in temperature, emotionally, etc.).
Meaning
2 senses(not comparable)Very cold (in temperature, emotionally, etc.).
(not comparable)Completely unconscious.
Dictionary text adapted from Wiktionary (Wiktionary contributors, CC BY-SA 4.0) and Open English WordNet / Princeton WordNet (CC BY 4.0, WordNet License); shared under CC BY-SA 4.0. Example sentences and recordings are credited where they appear.