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turn signal

or turn-sig·nal

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noun
  1. any of four signal lights on the front left, front right, rear left, and rear right of an automotive vehicle that, when actuated by the driver, flash in pairs on the side toward which a turn is to be made.
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Also called directional signal.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018