Definition of rainy day in US English:

rainy day

noun

  • 1A day characterized or dominated by rainfall; (Meteorology) = rain day.

  • 2Figurative. A possible future time of hardship or relative poverty. Frequently in "for (also against) a rainy day".

Origin

Late Middle English; earliest use found in John Trevisa (c1342–?1402), translator. From rainy + day.

Pronunciation

rainy day

/ˌreɪnɪ ˈdeɪ/