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

Derived forms: pissing down, pisses down, pissed down

Type of: rain, rain down