to be in the red = have no money in one's bank account.
to catch someone red-handed = discover somebody in the act of doing something wrong or criminal. I caught the boys red-handed smoking in the kitchen.
to roll out the the red carpet = to give a special welcome to an important visitor. We haven't seen Uncle Jones for years, so when he arrives tomorrow from Europe, we'll be rolling out the red carpet.
to see red = become very angry. Her criticisms were enough to make anyone see red.
a red herring = unimportant matter introduced into a discussion to divert attention from the main subject. Make sure he answers all your questions. Don't let him confuse you with any red herring.
red tape = excessive bureaucracy.
It takes weeks to get that visa. There's so much red tape involved.
a red-letter day = an important or memorable day because something good happened on it.
Exercise
Choose the right answer.
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