(Australia, Canada, India, New Zealand, UK) rain check

plural of rain man

(idiomatic) Any voucher or note from a merchant to a customer to provide an item the merchant has run out of at a later date for the item's current price, or (in a more literal sense) to provide a service at a later date.

(simile, colloquial) Very good; all in order; healthy. / (simile, colloquial) Correct; factually accurate.

A device used in meteorology to measure rainfall; a pluviometer.

(idiomatic) Regardless of what the circumstances are, and how the weather is.

The yellow-billed cuckoo (Coccyzus americanus)

rain contaminated by fungi spores, soot, or other particulate matter / radioactive rain that fell on Hiroshima following the atomic bombing of 1945

The first rainfall of a season, at the start of spring in cold climates or the end of summer in hot, dry climates.

plural of rain tree