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turn signal

 
pronunciation:
tuhrn sIg nl
part of speech: noun
definition: any of the lights on a motor vehicle that flash to indicate that the vehicle is about to turn and to show the direction in which it will turn. Turn signals are located on both the front and rear of the vehicle and are activated by the driver.
Don't forget to put on your turn signal if you're going to make a turn.
synonyms:
blinker, directional signal