Red is a yell. "Red is a warning symbol that screams, 'WATCH OUT.'" When we suffer a cut on our hand, "red squiggles out," according to the poem. It's also the color of blood. Shout means to call out loudly; make known one's feelings strongly. So, to shout red means to call out loudly and clearly. The word "shout" comes from the Middle English shoute, which came from the Old French eschute, meaning a loud cry or call. The modern word "esquire" comes from the same source as "shout." The term "red flag" comes from the days when farmers would wave red flags in the wind to warn other farmers that their fields were ready for harvest. Today, these are used to signal an upcoming hazard such as a curve in the road ahead. If you see this sign, slow down and be aware of what's coming. The expression "red letter day" comes from the days when letters were written on paper with red ink. Today, these letters are more likely to be found in newspapers but they still hold true to their meaning: important information. The phrase "red tape" comes from the days when documents were kept on rolls of paper with red edges.