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Verb: pelt down
Usage: informal
  1. Rain heavily
    "Put on your rain coat— it's pelting down outside!";
    - pour, pelt, rain cats and dogs [informal], rain buckets [informal], belt down [informal], bucket [Brit, informal], teem [informal], tip [Brit, informal], chuck it down [Brit, informal], chuck [Brit, informal]

Type of: rain, rain down