red light: Meaning and Definition of

red' light'

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.

red-light

1. to stop or deter by means of or as if with a red light.