Also found in: Dictionary.
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To come down from the sky very forcefully and in great amounts. The rain has been pelting down for almost a week straight! I'm surprised our car wasn't damaged from the way that hail was pelting down.
pelt down (on someone or something)
[for something] to fall down on someone or something hard or in quantity. (Typically rain, hail, sleet, stones, etc.) The rain pelted down on the children as they ran to their school bus. The ashes from the volcanic eruption pelted down on the town, covering the houses in a gray shroud.