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code blue

American  

noun

  1. (often initial capital letters) a medical emergency in which paramedics are dispatched to aid a person undergoing cardiac arrest.

Etymology

Origin of code blue

First recorded in 1980–85

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.