like waving a red flag in front of a bull

- what you are doing will definitely make someone angry or upset
Talking about the city mayor with my father is like waving a red flag in front of a bull. He hates the city mayor.
out of the red

- out of debt
Our company is finally out of the red and we are now making money.
paint the town red

- to go out and party and have a good time
When my cousin came to visit us we decided to go out and paint the town red.
red-carpet treatment

- to receive special or royal treatment
I always receive the red-carpet treatment when I go and visit my aunt.
red-eye

- an airplane flight that leaves late at night and arrives early in the morning
We caught the red-eye flight last night and we are very tired today.
a red flag

- a signal that something is not working properly or correctly
The fallen trees along the road raised a red flag for the safety inspectors.
red herring

- an unimportant matter that draws attention away from the main subject
Talking about the other issue was a red herring that did not do anything to deal with today's problem.
red-hot

- very hot, creating much excitement or demand
The new video game is red-hot and many people are waiting to buy one.
red in the face

- embarrassed
I became red in the face when the teacher asked me a question.
red-letter day

- a day that is memorable because of some important event
It was a red-letter day when my sister received her graduation diploma.
red tape

- excessive formalities in official business
Many businesses complain about the red tape that they must deal with in order to get anything done with the government.
roll out the red carpet

- to greet a person with great respect, to give a big welcome to someone
The government rolled out the red carpet when the politician came to visit.
see red

- to become very angry
My boss saw red when I told him that I would not be coming to work today.