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plural thundershowers
A rain shower accompanied by thunder and lightning. quotations examples
[S]ometimes, like the priests of Baal in the Bible, he would cut himself with knives till the blood fell upon the ground in great drops suggestive of an oncoming thunder-shower.
1920, Edward Carpenter, Pagan and Christian Creeds, New York: Harcourt, Brace and Co., published 1921, page 72