It's raining cats and dogs
US /ɪts ˌreɪnɪŋ ˌkæts ənd ˈdɔɡz/
UK /ɪts ˌreɪnɪŋ ˌkæts ənd ˈdɔɡz/

1.
piovere a catinelle, piovere a dirotto
raining very heavily
:
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I can't go out now, it's raining cats and dogs!
Non posso uscire ora, piove a catinelle!
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We had to cancel the picnic because it was raining cats and dogs.
Abbiamo dovuto annullare il picnic perché pioveva a catinelle.