A light that flashes on and off to signal direction on a vehicle, or a device that makes something blink.
From the verb 'blink' (to open and close eyes quickly), with the suffix '-er' meaning 'something that does the action.' Used for vehicles starting in the early 20th century.
Blinkers are so important for safety that many countries require them by law—they're one of the simplest but most effective communication tools on the road!
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