redlight

noun

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.

verb (used with object), red-light·ed, red-light·ing.

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

noun

1. a signal to stop, esp a red traffic signal in a system of traffic lights
2. a danger signal
3. an instruction to stop or discontinue
4. 1. a red lamp in a window of or outside a house indicating that it is a brothel
   2. (as modifier)a red-light district