Idiom about “Red” Color *be on red alert if soldiers are on full alert, they know that a situation is dangerous and are prepared to act immediately if necessary *red tape official rules which do not seem necessary and make things happen very slowly *a red herring something that takes people's attention away from the main subject being talked or written about *be in the red to owe money to a bank *be like a red rag to a bull if a statement or an action is like a red rag to a bull, it makes someone very angry *not a red cent no money at all *roll out the red carpet to give an important person a special welcome *see red to become very angry *catch sb red-handed to discover someone doing something illegal or wrong *a red-letter day a day that is very important or very special the red-light district the part of a city where many people offer sex for money *red-blooded a red-blooded man has a lot of energy and enjoys sex very much *red-hot very exciting or successful *paint the town red (informal) to go out and enjoy yourself in the evening, often drinking a lot of alcohol and dancing