Colours - 'Red' Idioms

Like a red rug to a bull: something that infuriates somebody.

Catch somebody red-handed: catch a person in the act of doing something.

Get/give somebody the red carpet treatment: very special treatment.

Red-letter day: an important day.

Be in the red: be in debt.

Not worth a red cent: be worthless.

Be out of the red: be out of debt.

Paint the town red: have a wild celebration.

Red herring: a piece of information or suggestion introduced to draw attention from the real facts of a situation.

Be red in the face: be embarrassed.

Be as red as a beetroot: be very red.

Red tape: bureaucracy

See red: be or make somebody angry.

Red-hot: highly excited, furious.

Red ensign/duster: red flag with the union flag in one corner used by the British merchant ships.

Red meat: beef and mutton.

Red flag: symbol of danger or revolution.

Red light district:  area with houses of ill fame.

Red head: person having red hair.                         

Red coat: British soldier (old use)

Red breast: robin

To show the red card:  to be dismissed from your job.