raining cats and dogs

raining very hard

Raining animals is a relatively rare meteorological phenomenon, although occurrences have been reported from many countries throughout history. One hypothesis that has been furthered to explain this phenomenon is that strong winds travelling over water sometimes pick up debris such as fish or frogs, and carry them for up to several miles. However, this primary aspect of the phenomenon has never been witnessed or scientifically tested.
See more at Wikipedia.org...

raining hard, raining heavily You need a raincoat, Dear. It's raining cats and dogs!

PIOVENDO A DIROTTO. PIOVENDO A CATINELLE