gullywasher

[ guhl-ee-wosh-er, -waw-sher ]
/ ˈgʌl iˌwɒʃ ər, -ˌwɔ ʃər /

noun Chiefly Midland and Western U.S.

a usually short, heavy rainstorm.

Origin of gullywasher

First recorded in 1815–25; gully1 + washer
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019