Seeing red

An idiom used to describe a state of sudden, intense anger or rage. The phrase likely originates from the physiological sensation of blood rushing to the head and eyes during extreme anger, or possibly from the popular (though scientifically inaccurate) belief that the color red provokes bulls in bullfighting.

There is currently no significant linguistic controversy or debate regarding the acceptability of this term. It is widely considered a neutral idiom for describing anger and is not generally viewed as offensive, exclusionary, or historically loaded by any specific group.

Example:
"When the referee made that bad call, the coach started seeing red."

Example:
"I was seeing red after I found out they had lied to me about the budget."