brake light

English Thesaurus

1. a red light on the rear of a motor vehicle that signals when the brakes are applied to slow or stop (noun.communication)

hypernym	:	visual signal,
definition	:	a signal that involves visual communication (noun.communication)

part meronym	:	brake system, brakes,
definition	:	a braking device consisting of a combination of interacting parts that work to slow a motor vehicle (noun.artifact)