stoplight noun2 •(US, Philippines) A traffic control signal, traditionally consisting of three lights, colored green, yellow/amber, and red, meaning proceed, prepare to stop, and stop, respectively. •A light on the rear of a vehicle that is activated when braking; a brake light.The rear lamps are combined with the service stoplights and are contained in stoplight part and blackout marker light assemblies at the rear of the vehicle. — 1973 formsstoplights
