pelt down
US /pelt daʊn/
UK /pelt daʊn/

1.
caer a cántaros, llover a mares
to rain very heavily
:
•
The rain began to pelt down just as we left the house.
La lluvia empezó a caer a cántaros justo cuando salimos de casa.
•
We had to take shelter because it was pelting down.
Tuvimos que refugiarnos porque estaba lloviendo a cántaros.