Green light
Green light noun - The approval by someone in authority for the doing of something.
Warning sign and green light are semantically related. In some cases you can use "Warning sign" instead a noun phrase "Green light".
Warning sign
Green light and warning sign are semantically related. Sometimes you can use "Green light" instead a noun phrase "Warning sign".
Cite this Source
Warning sign and Green light. (2016). Retrieved 2026, August 09, from https://thesaurus.plus/related/green_light/warning_sign
Green light & Warning sign. N.p., 2016. Web. 09 Aug. 2026. <https://thesaurus.plus/related/green_light/warning_sign>.
Warning sign or Green light. 2016. Accessed August 09, 2026. https://thesaurus.plus/related/green_light/warning_sign.
Google Ngram Viewer shows how "green light" and "warning sign" have occurred on timeline