n. (c./u.)Noun (Countable/Uncountable)A term used in hospitals to indicate a patient is experiencing cardiac or respiratory arrest, requiring immediate medical intervention.
The doctor announced a 'code blue' in the ICU.
n. (c./u.)Noun (Countable/Uncountable)A signal indicating an emergency situation requiring immediate action.
When the fire alarm went off, it was a 'code blue' situation for everyone in the building.