Euphemistic form of when Hell freezes over.

(idiomatic) When one makes a significant amount of money. / (idiomatic) When one is successful

Alternative form of when pigs fly

Warning, often in the form of a sign, that people should pay attention when walking on a wet and slippery floor not to fall down and get injured.

(idiomatic) Synonym of kick someone when they are down (“make things worse for someone in a difficult position”)

(idiomatic) To make things worse for someone in an adverse situation.

(idiomatic) Synonym of kick someone when they are down (“make things worse for someone in a difficult position”)

When faced with a difficult decision, it is better not to take unnecessary risks. Also when in doubt, abstain and when in doubt, leave it out

(archaic, slang) An extremely long time ago; long before living memory.

Third-person singular simple present indicative form of strike someone when they are down