red-out
n.— «The scope should not be advanced against resistance. “Red-out” is the term used to describe what occurs when the tip of the scope is placed too close to the bowel wall mucosa. In this situation, the reflection of light off the vascularized tissue produces a red haze. By slightly withdrawing the scope, the endoscopist can again obtain a clear view of the bowel wall.» —“Health: Screening for Colorectal Cancer” Ghana News Oct. 9, 2008. (source: Double-Tongued Dictionary)
Further reading
Artie in New Bern, North Carolina, wonders why a poker hand consisting of a pair of aces and a pair of eights is called a dead man’s hand. Legend has it that when Wild Bill Hickock was killed during a poker game in 1876 in the Dakota...
How do we agree on how to name shades and tints of colors? A famous study in the 1960s, Basic Color Terms: Their Universality and Evolution (Bookshop|Amazon by Brent Berlin and Paul Kay found that if a language had only two color terms, they were...