1. a red lamp, used as a traffic signal to mean “stop.”
2. an order or directive to halt an action, project, etc.: There's a red light on all unnecessary expenses.
3. a children's running game in which players must stop when “Red light!” is called.
4. a signal of danger; warning.
Pronunciation: (red'līt'), [key]
—v.t., -light•ed, -light•ing.
Informal.to stop or deter by means of or as if with a red light.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.