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cold day in Hell

cold day in Hell

9.4
An event that is very unlikely to happen
  • idiom
  • Informal
translation icon : un día frío en el infierno
  • Seeing him admit he was wrong is a cold day in Hell.

Because it was going to be a cold day in hell before China could build a better car engine than Porsche or Toyota or or even AUS one, right?

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Examples

  • It will be a cold day in Hell before I trust him again.

  • Because it was going to be a cold day in hell before China could build a better car engine than Porsche or Toyota or or even AUS one, right?

  • The team's success seemed a cold day in Hell given their recent performance.

Synonyms

until hell freezes over
vscold day in Hell
  • Informal
1 9.5

For a very long time, often to say something will never happen

stresses that an event is extremely unlikely or will never happen
snowball in hell
vscold day in Hell
  • Informal
9.4

An almost impossible chance of happening

covers very unlikely events and also those that will never happen

Surface Forms

Morphology

cold + day + in + Hell

The literal meanings of 'cold', 'day', 'in' and 'Hell' are clear, and the contradiction between 'cold' and the culturally expected heat of Hell can signal impossibility to a learner. However, this is a conventional idiom relying on cultural knowledge and figurative inference rather than straightforward compositional meaning, so while its sense (extremely unlikely) can sometimes be guessed, it is not fully predictable for a B1 learner without prior exposure.

Etymology

Cold day in Hell uses the sharp image of Hell—a place thought to be always hot—so a cold day there would be impossible, and that picture makes the phrase memorable. So people say it to mean 'something is extremely unlikely' or 'will never happen'.