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gullywasher

[guhl-ee-wosh-er, -waw-sher]
noun Chiefly Midland and Western U.S.
  1. a usually short, heavy rainstorm.
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Origin of gullywasher

First recorded in 1815–25; gully1 + washer
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018