# put on the red light

idiom

Source: https://englishreference.com/idiom/put-on-the-red-light
Updated: 2026-08-10

## Meaning

To advertise oneself as a prostitute.

## Examples

- She was forced to put on the red light to survive.
- The desperate woman had to put on the red light just to pay her rent.
- In the darkest corners of the city, many women were driven by poverty to put on the red light.

## Origin

Derived from the tradition of placing a red light in the windows of establishments involved in the sex trade. The practice provided a visual indicator for those seeking such services and subsequently informed the designation of the red-light district.

---

From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.