hole punch cloud
n.— «“Hole punch clouds,” also known as “fallstreak holes,” occur when patches of high cloud freeze and fall as ice crystals, leaving a dramatic gap behind.» —“Holes over Louisiana” Cloud Appreciation Society Feb. 6, 2007. (source: Double-Tongued Dictionary)
Further reading
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Loretta in Shreveport, Louisiana, wants to know what lexical and dialectal clues linguists look for when guessing where someone is from. She also wonders: Do people with long careers in the military or who grew up in a military family have a...