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1.
A soprano (usually in a middle to high school choir) who shows the audience how high her voice is going by raising her eyebrows to extreme heights.
"Stop raising your eyebrows during the high parts!" the choir director yelled. "I don't want any eyebrow sopranos."

Guy #1: Dude, that note's a high G!
Guy #2: Yeah, I can tell because of the eyebrow sopranos.
by Oyashiro-sama April 21, 2011