
der Blinker
turn signal
A light on a vehicle that flashes to indicate that you want to turn or change lanes. It is also called a direction indicator.
Du musst vor dem Abbiegen den Blinker setzen.
You have to use your turn signal before turning.
turn signal / lure
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turn signal
A light on a vehicle that flashes to indicate that you want to turn or change lanes. It is also called a direction indicator.
Du musst vor dem Abbiegen den Blinker setzen.
You have to use your turn signal before turning.

fishing lure
An artificial bait used in fishing, made of a small metal plate that attracts fish in the water through reflected light.
Er hat den großen Hecht mit einem silbernen Blinker gefangen.
He caught the big pike with a silver fishing lure.
The noun 'der Blinker' (turn signal / fishing lure) is derived directly from the verb 'blinken' (to blink/flash). So it describes something that intentionally lights up briefly and repeatedly.
Das Licht auf dem Turm blinkt in der Nacht.
The light on the tower flashes at night.
Whether it means the direction indicator on a car or the fishing lure can only be recognized from context. If the topic is traffic and vehicles, the first meaning is meant. If the topic is fishing, the second meaning is meant.
Der Autofahrer vor mir hat vergessen, den Blinker zu setzen.
The driver in front of me forgot to use his turn signal.
In the context of driving, 'der Blinker' (turn signal) is usually used with the verbs 'setzen' (to signal/use), 'einschalten' (to switch on), or 'betätigen' (to operate/use).
Bitte schalte den Blinker ein, bevor du die Spur wechselst.
Please switch on your turn signal before you change lanes.