The red light of a traffice signal.
red light definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- any danger or warning signal; specif., a red lamp, flare, etc.
- a red stoplight
red light definition by American Heritage Dictionary
- The red-colored light that signals traffic to stop.
- Informal A command to stop.